fs/9p: Fix error handling in v9fs_get_sb

This was introduced by 7cadb63d58a932041afa3f957d5cbb6ce69dcee5

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
1 file changed