Fix coding style

- Use block for single statement ifs
- Keep lines to reasonable length (current debate as to reasonable)
- When functions return -1 for error test against 0 not -1
- Do not indent cases another level
- Do not test against NULL and 0 explicitly
- Use tabs for indentation, use spaces for alignment

components/datetime.c

@@ -9,8 +9,9 @@ datetime(const char *fmt)
 	time_t t;
 
 	t = time(NULL);
-	if (strftime(buf, sizeof(buf), fmt, localtime(&t)) == 0)
+	if (!strftime(buf, sizeof(buf), fmt, localtime(&t))) {
 		return NULL;
+	}
 
 	return buf;
 }