9p/fs: add MODULE_DESCIPTION

Fix modpost warning that MODULE_DESCRIPTION is missing in fs/9p/9p.o

Signed-off-by: Dominique Martinet <[e-mail]>
Message-ID: <[e-mail]>
Reviewed-by: Christian Schoenebeck <[e-mail]>

fs/9p/v9fs.c

···
 MODULE_AUTHOR("Latchesar Ionkov <[e-mail]>");
 MODULE_AUTHOR("Eric Van Hensbergen <[e-mail]>");
 MODULE_AUTHOR("Ron Minnich <[e-mail]>");
+MODULE_DESCRIPTION("9P Client File System");
 MODULE_LICENSE("GPL");