[bugfix] block: fix memleaks in bdrv_refresh_filename · Pull Request !7 · src-openEuler/qemu

**[feature/bugfix]PR功能描述标题**:修复在block-commit过程中调用query-block产生内存泄漏问题，泄漏堆栈如下：
```
Indirect leak of 12360 byte(s) in 3 object(s) allocated from:
    #0 0x7f80f0b6d970 in __interceptor_calloc (/lib64/libasan.so.5+0xef970)
    #1 0x7f80ee86049d in g_malloc0 (/lib64/libglib-2.0.so.0+0x5249d)
    #2 0x55ea95b5bb67 in qdict_new /mnt/sdb/qemu/qobject/qdict.c:29
    #3 0x55ea956cd043 in bdrv_refresh_filename /mnt/sdb/qemu/block.c:6427
    #4 0x55ea956cc950 in bdrv_refresh_filename /mnt/sdb/qemu/block.c:6399
    #5 0x55ea956cc950 in bdrv_refresh_filename /mnt/sdb/qemu/block.c:6399
    #6 0x55ea956cc950 in bdrv_refresh_filename /mnt/sdb/qemu/block.c:6399
    #7 0x55ea958818ea in bdrv_block_device_info /mnt/sdb/qemu/block/qapi.c:56
    #8 0x55ea958879de in bdrv_query_info /mnt/sdb/qemu/block/qapi.c:392
    #9 0x55ea9588b58f in qmp_query_block /mnt/sdb/qemu/block/qapi.c:578
    #10 0x55ea95567392 in qmp_marshal_query_block qapi/qapi-commands-block-core.c:95
    #11 0x55ea95a462ed in do_qmp_dispatch /mnt/sdb/qemu/qapi/qmp-dispatch.c:132
    #12 0x55ea95a467ab in qmp_dispatch /mnt/sdb/qemu/qapi/qmp-dispatch.c:175
    #13 0x55ea954c5cd1 in monitor_qmp_dispatch /mnt/sdb/qemu/monitor/qmp.c:120
    #14 0x55ea954c6ac0 in monitor_qmp_bh_dispatcher /mnt/sdb/qemu/monitor/qmp.c:209
    #15 0x55ea95b7ea9e in aio_bh_call /mnt/sdb/qemu/util/async.c:89
    #16 0x55ea95b7eef0 in aio_bh_poll /mnt/sdb/qemu/util/async.c:117
    #17 0x55ea95b9495e in aio_dispatch /mnt/sdb/qemu/util/aio-posix.c:459
    #18 0x55ea95b802e1 in aio_ctx_dispatch /mnt/sdb/qemu/util/async.c:260
    #19 0x7f80ee85a89c in g_main_context_dispatch (/lib64/libglib-2.0.so.0+0x4c89c)
    #20 0x55ea95b8defa in glib_pollfds_poll /mnt/sdb/qemu/util/main-loop.c:219
    #21 0x55ea95b8e0d4 in os_host_main_loop_wait /mnt/sdb/qemu/util/main-loop.c:242
    #22 0x55ea95b8e3b9 in main_loop_wait /mnt/sdb/qemu/util/main-loop.c:518
    #23 0x55ea94b94d83 in main_loop /mnt/sdb/qemu/vl.c:1810
    #24 0x55ea94ba7c6f in main /mnt/sdb/qemu/vl.c:4471
    #25 0x7f80ebcff812 in __libc_start_main (/lib64/libc.so.6+0x23812)
    #26 0x55ea943f37cd in _start (/mnt/sdb/qemu/build/x86_64-softmmu/qemu-system-x86_64+0x27a47cd)

Indirect leak of 12360 byte(s) in 3 object(s) allocated from:
    #0 0x7f80f0b6d970 in __interceptor_calloc (/lib64/libasan.so.5+0xef970)
    #1 0x7f80ee86049d in g_malloc0 (/lib64/libglib-2.0.so.0+0x5249d)
    #2 0x55ea95b5bb67 in qdict_new /mnt/sdb/qemu/qobject/qdict.c:29
    #3 0x55ea956cd043 in bdrv_refresh_filename /mnt/sdb/qemu/block.c:6427
    #4 0x55ea956cc950 in bdrv_refresh_filename /mnt/sdb/qemu/block.c:6399
    #5 0x55ea956cc950 in bdrv_refresh_filename /mnt/sdb/qemu/block.c:6399
    #6 0x55ea958818ea in bdrv_block_device_info /mnt/sdb/qemu/block/qapi.c:56
    #7 0x55ea958879de in bdrv_query_info /mnt/sdb/qemu/block/qapi.c:392
    #8 0x55ea9588b58f in qmp_query_block /mnt/sdb/qemu/block/qapi.c:578
    #9 0x55ea95567392 in qmp_marshal_query_block qapi/qapi-commands-block-core.c:95
    #10 0x55ea95a462ed in do_qmp_dispatch /mnt/sdb/qemu/qapi/qmp-dispatch.c:132
    #11 0x55ea95a467ab in qmp_dispatch /mnt/sdb/qemu/qapi/qmp-dispatch.c:175
    #12 0x55ea954c5cd1 in monitor_qmp_dispatch /mnt/sdb/qemu/monitor/qmp.c:120
    #13 0x55ea954c6ac0 in monitor_qmp_bh_dispatcher /mnt/sdb/qemu/monitor/qmp.c:209
    #14 0x55ea95b7ea9e in aio_bh_call /mnt/sdb/qemu/util/async.c:89
    #15 0x55ea95b7eef0 in aio_bh_poll /mnt/sdb/qemu/util/async.c:117
    #16 0x55ea95b9495e in aio_dispatch /mnt/sdb/qemu/util/aio-posix.c:459
    #17 0x55ea95b802e1 in aio_ctx_dispatch /mnt/sdb/qemu/util/async.c:260
    #18 0x7f80ee85a89c in g_main_context_dispatch (/lib64/libglib-2.0.so.0+0x4c89c)
    #19 0x55ea95b8defa in glib_pollfds_poll /mnt/sdb/qemu/util/main-loop.c:219
    #20 0x55ea95b8e0d4 in os_host_main_loop_wait /mnt/sdb/qemu/util/main-loop.c:242
    #21 0x55ea95b8e3b9 in main_loop_wait /mnt/sdb/qemu/util/main-loop.c:518
    #22 0x55ea94b94d83 in main_loop /mnt/sdb/qemu/vl.c:1810
    #23 0x55ea94ba7c6f in main /mnt/sdb/qemu/vl.c:4471
    #24 0x7f80ebcff812 in __libc_start_main (/lib64/libc.so.6+0x23812)
    #25 0x55ea943f37cd in _start (/mnt/sdb/qemu/build/x86_64-softmmu/qemu-system-x86_64+0x27a47cd)

```

**该PR关联的issue** *(格式为fixes #<issue号>, 或者resolves #<issue号>)*: fixes #

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