Fix heap corruption

As its name says, CFDictionaryGetValue() follows "The Get Rule",
i.e. you don't have ownership of the object returned, so it shouldn't
be released.

Change-Id: Ie605ac21754ed479911d8f4ceb00744a6df600aa

vcl/coretext/salcoretextfontutils.cxx

@@ -76,7 +76,6 @@ static bool GetDevFontAttributes( CTFontDescriptorRef font_descriptor, ImplDevFo
     CFDictionaryRef traits = (CFDictionaryRef)CTFontDescriptorCopyAttribute(font_descriptor, kCTFontTraitsAttribute);
     CFNumberRef symbolics = (CFNumberRef)CFDictionaryGetValue(traits, kCTFontSymbolicTrait);
     CFNumberGetValue(symbolics, kCFNumberIntType, &value);
-    CFRelease(symbolics);
 
     if(value & kCTFontMonoSpaceTrait)
     {