qemu-img: Fix leak

qemu-img: Fix leak

create_opts was leaked here.  This is not too bad since the process is
about to exit anyway, but relying on that does not make the code nicer
to read.

Fixes: d402b6a21a825a5c07aac9251990860723d49f5d
Reported-by: Kevin Wolf <kwolf@redhat.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit 3ecd5a4f19fd9a497490a91aaa96e76a5edadd2c)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>