Mac: Fix fallback font selection for custom fonts

Source/platform/fonts/mac/FontCacheMac.mm

Index: Source/platform/fonts/mac/FontCacheMac.mm
diff --git a/Source/platform/fonts/mac/FontCacheMac.mm b/Source/platform/fonts/mac/FontCacheMac.mm
index 95d85f51db4860b494582be4d5cfca3bd160b2fb..16361f85c52265b5b769a8f06c00523de6fbe4b3 100644
--- a/Source/platform/fonts/mac/FontCacheMac.mm
+++ b/Source/platform/fonts/mac/FontCacheMac.mm
@@ -155,8 +155,8 @@ PassRefPtr<SimpleFontData> FontCache::platformFallbackForCharacter(const FontDes
 
     if (traits != substituteFontTraits || weight != substituteFontWeight || !nsFont) {
         if (NSFont *bestVariation = [fontManager fontWithFamily:[substituteFont familyName] traits:traits weight:weight size:size]) {
-            if (!nsFont || (([fontManager traitsOfFont:bestVariation] != substituteFontTraits || [fontManager weightOfFont:bestVariation] != substituteFontWeight)
-                && [[bestVariation coveredCharacterSet] longCharacterIsMember:character]))
+            if ((!nsFont || [fontManager traitsOfFont:bestVariation] != substituteFontTraits || [fontManager weightOfFont:bestVariation] != substituteFontWeight)
+                && [[bestVariation coveredCharacterSet] longCharacterIsMember:character])
                 substituteFont = bestVariation;
         }
     }