ectool: Add newline to warning message

Cosmetic fix:

$ sudo ./ectool -p
Cannot get EC ports from /proc/ioports, fallback to default.EC RAM:

Change-Id: Icc2b5bbbbfe7685e4fe512af029ce00b33a26daa
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46666
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by:  Felix Singer <felixsinger@posteo.net>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

util/ectool/ectool.c

@@ -127,7 +127,7 @@ int main(int argc, char *argv[])
 
 	if (get_ports && get_ec_ports() != 0)
 		fprintf(stderr, "Cannot get EC ports from /proc/ioports, "
-				"fallback to default.");
+				"fallback to default.\n");
 
 	if (iopl(3)) {
 		printf("You need to be root.\n");