9p: fix memleak in fs/9p/v9fs.c
This patch fixes a memory leak introduced by
commit ba17674fe02909fef049fd4b620a2805bdb8c693.
Spotted by the Coverity checker.
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>