No need for the forward declaration.

diff /home/jrick/src/got
commit - 7b53188e4c59d5ce295c92624cacdeee16881abd
path + /home/jrick/src/got
blob - 158ecdaac43d28f8eb32bc6f3acf1cfda482fcaf
file + lib/worktree.c
--- lib/worktree.c
+++ lib/worktree.c
@@ -65,8 +65,16 @@ static mode_t		 apply_umask(mode_t);
 #define GOT_MERGE_LABEL_MERGED	"merged change"
 #define GOT_MERGE_LABEL_BASE	"3-way merge base"
 
-static mode_t		 apply_umask(mode_t);
+static mode_t
+apply_umask(mode_t mode)
+{
+	mode_t um;
 
+	um = umask(000);
+	umask(um);
+	return mode & ~um;
+}
+
 static const struct got_error *
 create_meta_file(const char *path_got, const char *name, const char *content)
 {
@@ -1131,16 +1139,6 @@ static mode_t
 	return st_mode;
 }
 
-static mode_t
-apply_umask(mode_t mode)
-{
-	mode_t um;
-
-	um = umask(000);
-	umask(um);
-	return mode & ~um;
-}
-
 /* forward declaration */
 static const struct got_error *
 install_blob(struct got_worktree *worktree, const char *ondisk_path,