[PATCH v1] fs: Add function declaration of simple_dname

From: Leon Romanovsky <leonro@nvidia.com>

The simple_dname() is declared in internal header file but the
declaration is missing in d_path.c.

The compilation with W=1 generates the following GCC warning.

fs/d_path.c:311:7: warning: no previous prototype for 'simple_dname' [-Wmissing-prototypes]
  311 | char *simple_dname(struct dentry *dentry, char *buffer, int buflen)
      |       ^~~~~~~~~~~~

Fixes: 7e5f7bb08b8c ("unexport simple_dname()")
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
---
Changelog:
v1: Dropped "extern" removal chunk
v0: https://lore.kernel.org/lkml/20200819083259.919838-1-leon@kernel.org/ (local)
---
 fs/d_path.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/d_path.c b/fs/d_path.c
index 0f1fc1743302..4b89448cc78e 100644
--- a/fs/d_path.c
+++ b/fs/d_path.c

@@ -8,6 +8,8 @@
 #include <linux/prefetch.h>
 #include "mount.h"

+#include "internal.h"
+
 static int prepend(char **buffer, int *buflen, const char *str, int namelen)
 {
 	*buflen -= namelen;
--

2.26.2