block: An empty filename counts as no filename
Reproducer: $ ./qemu-img info '' qemu-img: ./block.c:1008: bdrv_open_driver: Assertion `!drv->bdrv_needs_filename || bs->filename[0]' failed. [1] 26105 abort (core dumped) ./qemu-img info '' This patch fixes this to be: $ ./qemu-img info '' qemu-img: Could not open '': The 'file' block driver requires a file name Cc: qemu-stable <qemu-stable@nongnu.org> Signed-off-by: NMax Reitz <mreitz@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NFam Zheng <famz@redhat.com> Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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