more test fixes

Author: DmitriyMusatkin

tests/s3_checksum_context_test.c

@@ -50,12 +50,6 @@ static int s_test_upload_request_checksum_context_get_checksum_cursor(struct aws
     return AWS_OP_SUCCESS;
 }
 
-static struct aws_string *s_test_fn(struct aws_s3_meta_request *req, void *user) {
-    (void)req;
-    (void)user;
-    return NULL;
-}
-
 AWS_TEST_CASE(
     test_upload_request_checksum_context_get_checksum_cursor,
     s_test_upload_request_checksum_context_get_checksum_cursor)
@@ -106,7 +100,6 @@ static int s_test_upload_request_checksum_context_error_cases(struct aws_allocat
         .checksum_algorithm = AWS_SCA_CRC32,
         .location = AWS_SCL_NONE,
         .has_full_object_checksum = false,
-        .full_object_checksum_callback = s_test_fn,
     };
     struct aws_s3_upload_request_checksum_context *context3 =
         aws_s3_upload_request_checksum_context_new(allocator, &config3);