This patch causes compile error when make check.
LINKtests/test-qdist
migration/qemu-file.o: In function `qemu_fclose':
/tmp/qemu-test/src/migration/qemu-file.c:331: undefined reference to
`migrate_get_current'
/tmp/qemu-test/src/migration/qemu-file.c:333: undefined reference to
From: Lidong Chen
The channel_close maybe invoked by different threads. For example, source
qemu invokes qemu_fclose in main thread, migration thread and return path
thread. Destination qemu invokes qemu_fclose in main thread, listen thread
and COLO incoming thread.
Signed-off-by: Lidong Chen
