podman-mac-helper: exit 1 on error

We should return a proper exit code to signal the failure.

[NO NEW TESTS NEEDED] We do have any tests on macOS.

Fixes containers#17785

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

cmd/podman-mac-helper/main.go

@@ -53,6 +53,7 @@ func main() {
 
 	if err := rootCmd.Execute(); err != nil {
 		fmt.Fprintf(os.Stderr, "Error: %s\n", err.Error())
+		os.Exit(1)
 	}
 }