mdev-212 sporadic main.connect failures in 5.3

don't cast implicitly an int to a char, when a boolean value is desired.

sql/password.c

@@ -503,7 +503,7 @@ 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));
 }