Fix build warnings

Changelog-Fixed: Fix build warnings

damus/Models/HomeModel.swift

@@ -154,7 +154,7 @@ class HomeModel {
                 print("nwc: \(resp.req_id) not found in the postbox, nothing to remove [\(relay)]")
             }
             
-            guard let err = resp.response.error else {
+            guard resp.response.error != nil else {
                 print("nwc success: \(resp.response.result.debugDescription) [\(relay)]")
                 nwc_success(state: self.damus_state, resp: resp)
                 return

damus/Util/PostBox.swift

@@ -150,7 +150,7 @@ class PostBox {
             relayer.attempts += 1
             relayer.last_attempt = Int64(Date().timeIntervalSince1970)
             relayer.retry_after *= 1.5
-            if let relay = pool.get_relay(relayer.relay) {
+            if pool.get_relay(relayer.relay) != nil {
                 print("flushing event \(event.event.id) to \(relayer.relay)")
             } else {
                 print("could not find relay when flushing: \(relayer.relay)")

damus/Views/Muting/MutelistView.swift

@@ -42,9 +42,6 @@ struct MutelistView: View {
                 .swipeActions {
                     RemoveAction(pubkey: pubkey)
                 }
-                .onTapGesture {
-                    damus_state.nav.push(route: Route.ProfileByKey(pubkey: pubkey))
-                }
         }
         .navigationTitle(NSLocalizedString("Muted Users", comment: "Navigation title of view to see list of muted users."))
         .onAppear {

damus/Views/Relays/RelayDetailView.swift

@@ -72,10 +72,9 @@ struct RelayDetailView: View {
                 
                 if let pubkey = nip11.pubkey {
                     Section(NSLocalizedString("Admin", comment: "Label to display relay contact user.")) {
-                        UserViewRow(damus_state: state, pubkey: pubkey)
-                            .onTapGesture {
-                                state.nav.push(route: Route.ProfileByKey(pubkey: pubkey))
-                            }
+                        NavigationLink(value: Route.ProfileByKey(pubkey: pubkey), label: {
+                            UserViewRow(damus_state: state, pubkey: pubkey)
+                        })
                     }
                 }
                 if let relay_connection {