Revert "bugfix for test_bson_reserve_buffer_errors"

This reverts commit 05bd56a.

(Moved to CDRIVER-5915)

Author: Micah Scott

src/libbson/tests/test-bson.c

@@ -1886,11 +1886,7 @@ test_bson_reserve_buffer_errors (void)
    uint32_t len_le;
 
    /* too big */
-   ASSERT (!bson_reserve_buffer (&bson, (uint32_t) (BSON_MAX_SIZE - bson.len + 1u)));
-   /* exactly the maximum size */
-#if BSON_WORD_SIZE > 32
-   ASSERT (bson_reserve_buffer (&bson, (uint32_t) (BSON_MAX_SIZE - bson.len)));
-#endif
+   ASSERT (!bson_reserve_buffer (&bson, (uint32_t) (INT32_MAX - bson.len - 1)));
 
    /* make a static bson, it refuses bson_reserve_buffer since it's read-only */
    bson_destroy (&bson);