Fix 9052: Crash: SIGSEGV in Token::previous (this=0x0) while checking mariadb-10.0

lib/symboldatabase.cpp

@@ -5470,7 +5470,7 @@ void SymbolDatabase::setValueTypeInTokenList()
             setValueType(tok, vt);
         } else if (tok->str() == "return" && tok->scope()) {
             const Function *function = tok->scope()->function;
-            if (function) {
+            if (function && function->retDef) {
                 ValueType vt;
                 parsedecl(function->retDef, &vt, mDefaultSignedness, mSettings);
                 setValueType(tok, vt);

test/testtokenize.cpp

@@ -481,6 +481,9 @@ private:
         TEST_CASE(findGarbageCode);
         TEST_CASE(checkEnableIf);
 
+        // #9052
+        TEST_CASE(noCrash1);
+
         // --check-config
         TEST_CASE(checkConfiguration);
 
@@ -8783,6 +8786,14 @@ private:
 
     }
 
+    void noCrash1() {
+        ASSERT_NO_THROW(tokenizeAndStringify(
+                            "struct A {\n"
+                            "  A( const std::string &name = "" );\n"
+                            "};\n"
+                            "A::A( const std::string &name ) { return; }\n"))
+    }
+
     void checkConfig(const char code[]) {
         errout.str("");