Bug 777292 - Remove unreached return; r=ehsan

layout/mathml/nsMathMLChar.cpp

@@ -701,7 +701,6 @@ nsMathMLChar::GetStyleContext() const
   NS_ASSERTION(!mParent, "invalid call - not allowed for child chars");
   NS_ASSERTION(mStyleContext, "chars should always have style context");
   return mStyleContext;
-  return NS_OK;
 }
 
 void