Userland: Explicitly ignore number of types read, found by Coverity

Author: https://github.com/bgianfo
Commit: bcbac83a8b
Pull-request: https://github.com/SerenityOS/serenity/pull/3184
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/bugaevc

Userland/more.cpp

@@ -36,7 +36,7 @@ static void wait_for_key()
     printf("\033[7m--[ more ]--\033[0m");
     fflush(stdout);
     char dummy;
-    read(key_fd, &dummy, 1);
+    (void)read(key_fd, &dummy, 1);
     printf("\n");
 }