Fixed #3441 (segmentation fault of cppcheck (%: return ; ()))

lib/checkother.cpp

@@ -1627,6 +1627,9 @@ void CheckOther::checkUnreachableCode()
                 tok = Token::findmatch(secondBreak, "[}:]");
             } else
                 tok = secondBreak;
+
+            if (!tok)
+                break;
         }
     }
 }

test/testother.cpp

@@ -1914,6 +1914,8 @@ private:
               "    virtual void foo1 (P & Val) throw ();\n"
               "}");
         ASSERT_EQUALS("", errout.str());
+
+        check("%: return ; ()"); // Don't crash. #3441.
     }