Fix FP unknownMacro (#5249)

Author: chrchr-github

lib/tokenize.cpp

@@ -8059,6 +8059,8 @@ void Tokenizer::reportUnknownMacros() const
     // Report unknown macros before } "{ .. if (x) MACRO }"
     for (const Token *tok = tokens(); tok; tok = tok->next()) {
         if (Token::Match(tok, ")|; %name% } !!)")) {
+            if (tok->link() && !Token::simpleMatch(tok->link()->tokAt(-1), "if"))
+                continue;
             const Token* prev = tok->linkAt(2);
             while (Token::simpleMatch(prev, "{"))
                 prev = prev->previous();

test/testtokenize.cpp

@@ -6880,6 +6880,11 @@ class TestTokenizer : public TestFixture {
         ASSERT_NO_THROW(tokenizeAndStringify("void f(void* q) {\n"
                                              "    g(&(S) { .p = (int*)q });\n"
                                              "}\n", /*expand*/ true, cppcheck::Platform::Type::Native, "test.c"));
+
+        ASSERT_NO_THROW(tokenizeAndStringify("typedef struct { int i; } S;\n"
+                                             "void f(float a) {\n"
+                                             "S s = (S){ .i = (int)a };\n"
+                                             "}\n", /*expand*/ true, cppcheck::Platform::Type::Native, "test.c"));
     }
 
     void findGarbageCode() { // Test Tokenizer::findGarbageCode()