Address build warnings (#3052)

daemon/daemon-posix.cc

@@ -59,7 +59,7 @@ static void handle_signal(int sig)
         break;
 
     default:
-        assert("Unexpected signal");
+        assert("Unexpected signal" && 0);
     }
 }
 

libtransmission/platform-quota.cc

@@ -131,7 +131,7 @@ static char const* getdev(std::string_view path)
 
     for (int i = 0; i < n; i++)
     {
-        if (mnt[i].f_mntonname != nullptr && path == mnt[i].f_mntonname)
+        if (path == mnt[i].f_mntonname)
         {
             return mnt[i].f_mntfromname;
         }