Fix #13305 FN moduloofone with %= (#8353)

Author: chrchr-github

lib/checkother.cpp

@@ -4429,7 +4429,7 @@ void CheckOther::checkModuloOfOne()
     for (const Token *tok = mTokenizer->tokens(); tok; tok = tok->next()) {
         if (!tok->astOperand2() || !tok->astOperand1())
             continue;
-        if (tok->str() != "%")
+        if (tok->str() != "%" && tok->str() != "%=")
             continue;
         if (!tok->valueType() || !tok->valueType()->isIntegral())
             continue;

test/testother.cpp

@@ -13284,6 +13284,13 @@ class TestOther : public TestFixture {
               "    if (j % c) {}\n"
               "}\n");
         ASSERT_EQUALS("", errout_str());
+
+        check("void f() {\n"
+              "    int i = 0;\n"
+              "    i %= 1;\n"
+              "    (void)i;\n"
+              "}\n");
+        ASSERT_EQUALS("[test.cpp:3:7]: (style) Modulo of one is always equal to zero [moduloofone]\n", errout_str());
     }
 
     void sameExpressionPointers() {