fix some compiler warnings

src/Transformations/GlobalVariables/fix_common_blocks.cpp

@@ -224,6 +224,8 @@ bool equalDims(const CommConstraint& a, const CommConstraint& b)
         if (adim[i].second - adim[i].first != bdim[i].second - bdim[i].first)
             return false;
     }
+
+    return true;
 }