Include internal.h to fix below error:
fs/d_path.c:318:7: error: no previous prototype for ‘simple_dname’ [-Werror=missing-prototypes]
  318 | char *simple_dname(struct dentry *dentry, char *buffer, int buflen)
In fact, this function is declared in fs/internal.h.

Signed-off-by: Zhiguang Ni <zhiguangni01@gmail.com>
---
 fs/d_path.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/d_path.c b/fs/d_path.c
index e4e0ebad1f15..f9123b84f1ba 100644
--- a/fs/d_path.c
+++ b/fs/d_path.c
@@ -7,6 +7,7 @@
 #include <linux/slab.h>
 #include <linux/prefetch.h>
 #include "mount.h"
+#include "internal.h"
 
 struct prepend_buffer {
 	char *buf;
-- 
2.25.1