Bug #13934049: 64884: LOGINS WITH INCORRECT PASSWORD ARE ALLOWED

Fixed an improper type conversion on return that can make the server accept
logins with a wrong password.

sql/password.c

@@ -531,7 +531,7 @@ check_scramble(const char *scramble_arg, const char *message,
   mysql_sha1_reset(&sha1_context);
   mysql_sha1_input(&sha1_context, buf, SHA1_HASH_SIZE);
   mysql_sha1_result(&sha1_context, hash_stage2_reassured);
-  return memcmp(hash_stage2, hash_stage2_reassured, SHA1_HASH_SIZE);
+  return test(memcmp(hash_stage2, hash_stage2_reassured, SHA1_HASH_SIZE));
 }