unused struct member: bail out when casting

src/checkother.cpp

@@ -621,7 +621,7 @@ void CheckOther::checkStructMemberUsage()
             }
 
             // Bail out if some data is casted to struct..
-            const std::string s("( struct " + tok->next()->str() + " * ) & %var% [");
+            const std::string s("( struct| " + tok->next()->str() + " * ) & %var% [");
             if (Token::findmatch(tok, s.c_str()))
                 structname = 0;
         }

test/testunusedvar.cpp

@@ -164,6 +164,18 @@ private:
               "    struct AB *ab = (struct AB *)&buf[10];\n"
               "}\n");
         ASSERT_EQUALS("", errout.str());
+
+        check("struct AB\n"
+              "{\n"
+              "    int a;\n"
+              "    int b;\n"
+              "};\n"
+              "\n"
+              "void foo(char *buf)\n"
+              "{\n"
+              "    struct AB *ab = (AB *)&buf[10];\n"
+              "}\n");
+        ASSERT_EQUALS("", errout.str());
     }
 };