tweaks: move a function to before its callers and next to its kind

Also, improve the indentation of two random lines.

src/chars.c

@@ -265,6 +265,27 @@ int char_length(const char *pointer)
 		return 1;
 }
 
+/* Return the number of (multibyte) characters in the given string. */
+size_t mbstrlen(const char *pointer)
+{
+	size_t count = 0;
+
+	while (*pointer != '\0') {
+#ifdef ENABLE_UTF8
+		if ((signed char)*pointer < 0) {
+			int length = mblen(pointer, MAXCHARLEN);
+
+			pointer += (length < 0 ? 1 : length);
+		} else
+#endif
+			pointer++;
+
+		count++;
+	}
+
+	return count;
+}
+
 /* Parse a multibyte character from buf.  Return the number of bytes
  * used.  If chr isn't NULL, store the multibyte character in it.  If
  * col isn't NULL, add the character's width (in columns) to it. */
@@ -488,27 +509,6 @@ char *mbrevstrcasestr(const char *haystack, const char *needle,
 		return revstrcasestr(haystack, needle, pointer);
 }
 
-/* Count the number of (multibyte) characters in the given string. */
-size_t mbstrlen(const char *pointer)
-{
-	size_t count = 0;
-
-	while (*pointer != '\0') {
-#ifdef ENABLE_UTF8
-		if ((signed char)*pointer < 0) {
-			int length = mblen(pointer, MAXCHARLEN);
-
-			pointer += (length < 0 ? 1 : length);
-		} else
-#endif
-			pointer++;
-
-		count++;
-	}
-
-	return count;
-}
-
 #if !defined(NANO_TINY) || defined(ENABLE_JUSTIFY)
 /* This function is equivalent to strchr() for multibyte strings. */
 char *mbstrchr(const char *string, const char *chr)

src/proto.h

@@ -218,6 +218,7 @@ int mbwidth(const char *c);
 #endif
 char *make_mbchar(long chr, int *chr_mb_len);
 int char_length(const char *pointer);
+size_t mbstrlen(const char *s);
 int parse_mbchar(const char *buf, char *chr, size_t *col);
 size_t step_left(const char *buf, size_t pos);
 size_t step_right(const char *buf, size_t pos);
@@ -226,7 +227,6 @@ int mbstrncasecmp(const char *s1, const char *s2, size_t n);
 char *mbstrcasestr(const char *haystack, const char *needle);
 char *revstrstr(const char *haystack, const char *needle, const char *index);
 char *mbrevstrcasestr(const char *haystack, const char *needle, const char *index);
-size_t mbstrlen(const char *s);
 #if !defined(NANO_TINY) || defined(ENABLE_JUSTIFY)
 char *mbstrchr(const char *s, const char *c);
 #endif