de-nested one if block

src/n2n.c

@@ -428,47 +428,48 @@ 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;
-
-        // check_interval and last_check do not need to be guarded by the mutex because
-        // their values get changed and evaluated only here
-
-        if((now - param->last_checked > param->check_interval) || (requires_resolution)) {
-            // try to lock access
-            if(pthread_mutex_trylock(&param->access) == 0) {
-                // any changes?
-                if(param->changed) {
-                    // reset flag
-                    param->changed = 0;
-                    // unselectively copy all socks (even those with error code, that would be the old one because
-                    // sockets do not get overwritten in case of error in resolve_thread) from list to supernode list
-                    HASH_ITER(hh, param->list, entry, tmp_entry) {
-                        memcpy(entry->org_sock, &entry->sock, sizeof(n2n_sock_t));
-                        traceEvent(TRACE_INFO, "resolve_check renews ip address of supernode '%s' to %s",
-                                               entry->org_ip, sock_to_cstr(sock_buf, &(entry->sock)));
-                    }
-                }
+    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
+
+    if((now - param->last_checked > param->check_interval) || (requires_resolution)) {
+        // try to lock access
+        if(pthread_mutex_trylock(&param->access) == 0) {
+            // any changes?
+            if(param->changed) {
+                // reset flag
+                param->changed = 0;
+                // unselectively copy all socks (even those with error code, that would be the old one because
+                // sockets do not get overwritten in case of error in resolve_thread) from list to supernode list
+                HASH_ITER(hh, param->list, entry, tmp_entry) {
+                    memcpy(entry->org_sock, &entry->sock, sizeof(n2n_sock_t));
+                    traceEvent(TRACE_INFO, "resolve_check renews ip address of supernode '%s' to %s",
+                                           entry->org_ip, sock_to_cstr(sock_buf, &(entry->sock)));
+               }
+            }
 
-                // let the resolver thread know eventual difficulties in reaching the supernode
-                if(requires_resolution) {
-                    param->request = 1;
-                    ret = 0;
-                }
+            // let the resolver thread know eventual difficulties in reaching the supernode
+            if(requires_resolution) {
+                param->request = 1;
+                ret = 0;
+            }
 
-                param->last_checked = now;
+            param->last_checked = now;
 
-                // next appointment
-                if(param->request)
-                    // earlier if resolver still working on fulfilling a request
-                    param->check_interval = N2N_RESOLVE_CHECK_INTERVAL / 10;
-                else
-                    param->check_interval = N2N_RESOLVE_CHECK_INTERVAL;
+            // next appointment
+            if(param->request)
+                // earlier if resolver still working on fulfilling a request
+                param->check_interval = N2N_RESOLVE_CHECK_INTERVAL / 10;
+            else
+                param->check_interval = N2N_RESOLVE_CHECK_INTERVAL;
 
-                // unlock access
-                pthread_mutex_unlock(&param->access);
-            }
+            // unlock access
+            pthread_mutex_unlock(&param->access);
         }
     }
 #endif