templates: Enable fwsetup on EFI platforms only

Only perform call to fwsetup if one is on EFI platform. On all other
platforms fwsetup command does not exists, and thus returns 0 and
a useless uefi-firmware menu entry gets generated.

Signed-off-by: Dimitri John Ledkov <dimitri.ledkov@canonical.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

util/grub.d/30_uefi-firmware.in

@@ -31,10 +31,12 @@ LABEL="UEFI Firmware Settings"
 gettext_printf "Adding boot menu entry for UEFI Firmware Settings ...\n" >&2
 
 cat << EOF
+if [ "\$grub_platform" = "efi" ]; then
 	fwsetup --is-supported
-if [ "\$grub_platform" = "efi" -a "\$?" = 0 ]; then
+	if [ "\$?" = 0 ]; then
 		menuentry '$LABEL' \$menuentry_id_option 'uefi-firmware' {
 			fwsetup
 		}
 	fi
+fi
 EOF