Don't multiply by sizeof(char) as it's always 1

see: https://stackoverflow.com/questions/2215445/are-there-machines-where-sizeofchar-1-or-at-least-char-bit-8

Author: cmaloney

Objects/bytearrayobject.c

@@ -2705,10 +2705,10 @@ bytearray_sizeof_impl(PyByteArrayObject *self)
 /*[clinic end generated code: output=738abdd17951c427 input=e27320fd98a4bc5a]*/
 {
     Py_ssize_t res = _PyObject_SIZE(Py_TYPE(self));
-    Py_ssize_t alloc = FT_ATOMIC_LOAD_SSIZE_RELAXED(self->ob_alloc) * sizeof(char);
+    Py_ssize_t alloc = FT_ATOMIC_LOAD_SSIZE_RELAXED(self->ob_alloc);
     if (alloc > 0) {
         res += sizeof(PyBytesObject);
-        res += alloc * sizeof(char);
+        res += alloc;
     }
 
     return PyLong_FromSize_t(res);