de-nested one if block

src/n2n.c

@@ -428,10 +428,12 @@ uint8_t resolve_check (n2n_resolve_parameter_t *param, uint8_t requires_resoluti
     uint8_t ret = requires_resolution; /* if trylock fails, it still requires resolution */
 
 #ifdef HAVE_PTHREAD    
-    if(param != NULL) {
     n2n_resolve_ip_sock_t   *entry, *tmp_entry;
     n2n_sock_str_t sock_buf;
 
+    if(NULL == param)
+        return ret;
+    
     // check_interval and last_check do not need to be guarded by the mutex because
     // their values get changed and evaluated only here
 
@@ -470,7 +472,6 @@ uint8_t resolve_check (n2n_resolve_parameter_t *param, uint8_t requires_resoluti
             pthread_mutex_unlock(&param->access);
         }
     }
-    }
 #endif
 
     return ret;