locale.c: Reverse order of conditionals

Place the trivial case first; this also removes complementing the
conditional.

These make it easier to read

Author: khwilliamson

locale.c

@@ -8629,7 +8629,10 @@ S_strftime8(pTHX_ const char * fmt,
 
       case UTF8NESS_YES:    /* Known to be UTF-8; must be UTF-8 locale if can't
                                downgrade. */
-        if (! is_locale_utf8(locale)) {
+        if (is_locale_utf8(locale)) {
+            locale_utf8ness = LOCALE_IS_UTF8;
+        }
+        else {
             locale_utf8ness = LOCALE_NOT_UTF8;
 
             Size_t fmt_len = strlen(fmt);
@@ -8639,9 +8642,6 @@ S_strftime8(pTHX_ const char * fmt,
                 return false;
             }
         }
-        else {
-            locale_utf8ness = LOCALE_IS_UTF8;
-        }
 
         break;