fs/dcache: fix function param name in kernel-doc

Fix parameter name in kernel-doc notation (causes a warning).

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/dcache.c b/fs/dcache.c
index 166d35d..4d13bf5 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1976,7 +1976,7 @@
  * __d_path - return the path of a dentry
  * @path: the dentry/vfsmount to report
  * @root: root vfsmnt/dentry (may be modified by this function)
- * @buffer: buffer to return value in
+ * @buf: buffer to return value in
  * @buflen: buffer length
  *
  * Convert a dentry into an ASCII path name.