Fix Fdirectory_append check for whether strings have to be converted

* src/coding.c (string_ascii_p): Make it non-static.

* src/fileio.c (Fdirectory_append): Fix check for whether we need
to convert to multibyte.

* src/fns.c (string_ascii_p): Remove copy.

* src/lisp.h: Declare string_ascii_p.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/coding.c b/src/coding.c
index 46e7fca0f43..87b55aecc05 100644
--- a/src/coding.c
+++ b/src/coding.c
@@ -9476,7 +9476,7 @@ not fully specified.)  */)
 }
 
 /* Whether STRING only contains chars in the 0..127 range.  */
-static bool
+bool
 string_ascii_p (Lisp_Object string)
 {
   ptrdiff_t nbytes = SBYTES (string);