Revert unrelated changes

Author: vstinner

Objects/bytesobject.c

@@ -3831,23 +3831,13 @@ byteswriter_resize(PyBytesWriter *writer, Py_ssize_t new_size, int resize)
     }
 
     Py_ssize_t alloc = new_size;
-
-    if (writer->obj != NULL) {
-        if (resize && writer->overallocate) {
-            if (alloc <= (PY_SSIZE_T_MAX - alloc / OVERALLOCATE_FACTOR)) {
-                alloc += alloc / OVERALLOCATE_FACTOR;
-            }
-        }
-
-        if (new_size <= old_allocated + old_allocated / 8) {
-            /* Moderate upsize; overallocate similar to list_resize() */
-            alloc = new_size + (new_size >> 3);
-        }
-        else {
-            /* Major upsize; resize up to exact size */
-            alloc = new_size;
+    if (resize && writer->overallocate) {
+        if (alloc <= (PY_SSIZE_T_MAX - alloc / OVERALLOCATE_FACTOR)) {
+            alloc += alloc / OVERALLOCATE_FACTOR;
         }
+    }
 
+    if (writer->obj != NULL) {
         if (writer->use_bytearray) {
             if (PyByteArray_Resize(writer->obj, alloc)) {
 #ifdef Py_DEBUG
@@ -3870,9 +3860,6 @@ byteswriter_resize(PyBytesWriter *writer, Py_ssize_t new_size, int resize)
         assert(writer->obj != NULL);
     }
     else {
-        // Do not overallocate when the first bytes/bytearray object is
-        // allocated
-
         char *data;
         if (writer->use_bytearray) {
             writer->obj = PyByteArray_FromStringAndSize(NULL, alloc);