Revert "Test_cel: Fails when DONT_OPTIMIZE is off"

This reverts commit 9b85882f04.

Change-Id: I36cf159abb103502e48d6f8fd70d560d7f0bda56

include/asterisk/strings.h

@@ -1257,7 +1257,19 @@ static force_inline int attribute_pure ast_str_case_hash(const char *str)
  *
  * \retval str for convenience
  */
-char *attribute_pure ast_str_to_lower(char *str);
+static force_inline char *attribute_pure ast_str_to_lower(char *str)
+{
+	char *str_orig = str;
+	if (!str) {
+		return str;
+	}
+
+	for (; *str; ++str) {
+		*str = tolower(*str);
+	}
+
+	return str_orig;
+}
 
 /*!
  * \brief Convert a string to all upper-case

main/strings.c

@@ -391,17 +391,3 @@ char *ast_read_line_from_buffer(char **buffer)
 
 	return start;
 }
-
-char *attribute_pure ast_str_to_lower(char *str)
-{
-	char *str_orig = str;
-	if (!str) {
-		return str;
-	}
-
-	for (; *str; ++str) {
-		*str = tolower(*str);
-	}
-
-	return str_orig;
-}