CheckOther:checkNegativeBitwiseShift: Fix FP when shift is protected by ?:

lib/checkother.cpp

@@ -2663,6 +2663,17 @@ void CheckOther::checkNegativeBitwiseShift()
                     continue;
             }
 
+            // bailout if operation is protected by ?:
+            bool ternary = false;
+            for (const Token *parent = tok; parent; parent = parent->astParent()) {
+                if (Token::Match(parent, "?|:")) {
+                    ternary = true;
+                    break;
+                }
+            }
+            if (ternary)
+                continue;
+
             // Get negative rhs value. preferably a value which doesn't have 'condition'.
             const ValueFlow::Value *value = tok->astOperand2()->getValueLE(-1LL, _settings);
             if (value)

test/testother.cpp

@@ -5490,6 +5490,9 @@ private:
               "   std::cout << 3 << -1 ;\n"
               "}");
         ASSERT_EQUALS("", errout.str());
+        
+        check("x = y ? z << $-1 : 0;\n");
+        ASSERT_EQUALS("", errout.str());
     }
 
     void incompleteArrayFill() {