valueflow.cpp: fixed readability-math-missing-parentheses clang-tidy warnings

Author: firewave

lib/valueflow.cpp

@@ -547,7 +547,7 @@ size_t ValueFlow::getSizeOf(const ValueType &vt, const Settings &settings, Accur
                 if (currentBitfieldAlloc == 0) {
                     bits = n * charBit;
                 } else {
-                    bits = currentBitfieldAlloc * charBit - currentBitCount;
+                    bits = (currentBitfieldAlloc * charBit) - currentBitCount;
                 }
             }
             if (bits > 0) {
@@ -570,7 +570,7 @@ size_t ValueFlow::getSizeOf(const ValueType &vt, const Settings &settings, Accur
             n *= dim;
             size_t padding = (a - (total % a)) % a;
             if (currentBitCount > 0) {
-                bool fitsInBitfield = currentBitCount + n * charBit <= currentBitfieldAlloc * charBit;
+                bool fitsInBitfield = currentBitCount + (n * charBit) <= currentBitfieldAlloc * charBit;
                 bool isAligned = currentBitCount % (charBit * a) == 0;
                 if (vt2.isIntegral() && fitsInBitfield && isAligned) {
                     currentBitCount += charBit * n;