fix c.must_have

vlib/v/gen/c/testdata/alias_char_ptr_to_ptr.c.must_have

@@ -1,10 +1,8 @@
 VV_LOCAL_SYMBOL string main__get_two(void) {
 char* s = main__return_text_two();
-string _t1 = cstring_to_vstring(s);
-return _t1;
+return cstring_to_vstring(s);
 }
 VV_LOCAL_SYMBOL string main__get_one(void) {
 main__ALcharptr s = main__return_text_one();
-string _t1 = cstring_to_vstring(s);
-return _t1;
+return cstring_to_vstring(s);
 }

vlib/v/gen/c/testdata/if_else_return.c.must_have

@@ -5,6 +5,5 @@ _result_ok(&(string[]) { s }, (_result*)(&_t2), sizeof(string));
 } else {
 return (_result_string){ .is_error=true, .err=_v_error(_SLIT("empty")), .data={EMPTY_STRUCT_INITIALIZATION} };
 }
-_result_string _t1 =  _t2;
 return _t1;
 }