revert most of d7a0084

See php-memcached-dev/php-memcached#531

Author: m6w6

src/libmemcached/purge.cc

@@ -108,9 +108,6 @@ bool memcached_purge(memcached_instance_st *ptr) {
         WATCHPOINT_ERROR(rc);
         is_successful = false;
       }
-      if (rc == MEMCACHED_TIMEOUT) {
-        break;
-      }
 
       if (ptr->root->callbacks) {
         memcached_callback_st cb = *ptr->root->callbacks;

src/libmemcached/response.cc

@@ -761,7 +761,7 @@ static memcached_return_t _read_one_response(memcached_instance_st *instance, ch
     rc = textual_read_one_response(instance, buffer, buffer_length, result);
   }
 
-  if (memcached_fatal(rc) && rc != MEMCACHED_TIMEOUT) {
+  if (memcached_fatal(rc)) {
     memcached_io_reset(instance);
   }
 

test/tests/memcached/noblock.cpp

@@ -23,9 +23,6 @@ TEST_CASE("memcached_noblock") {
       break;
     case MEMCACHED_TIMEOUT:
     case MEMCACHED_WRITE_FAILURE:
-      if(!timeout) {
-        --i;
-      }
       ++hit;
       REQUIRE(true);
       break;