qga: fix 'driver' leak in guest-get-fsinfo

'driver' is leaked when the loop is not broken.

Leak introduced by commit 743c71d03c20d64f2bae5fba6f26cdf5e4b1bda6,
spotted by ASAN.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
1 file changed