Minor refactoring

Signal/src/AppDelegate.m

@@ -1386,9 +1386,10 @@ static NSTimeInterval launchStartedAt;
 {
     if (self.poller == nil) {
         NSString *userPublicKey = OWSIdentityManager.sharedManager.identityKeyPair.hexEncodedPublicKey;
-        if (userPublicKey == nil) { return; }
+        if (userPublicKey != nil) {
             self.poller = [[LKPoller alloc] init];
         }
+    }
     [self.poller startIfNeeded];
 }
 
@@ -1398,9 +1399,10 @@ static NSTimeInterval launchStartedAt;
 {
     if (self.closedGroupPoller == nil) {
         NSString *userPublicKey = OWSIdentityManager.sharedManager.identityKeyPair.hexEncodedPublicKey;
-        if (userPublicKey == nil) { return; }
+        if (userPublicKey != nil) {
             self.closedGroupPoller = [[LKClosedGroupPoller alloc] init];
         }
+    }
     [self.closedGroupPoller startIfNeeded];
 }