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/hostname.c

@@ -9,7 +9,7 @@
 const char *
 hostname(void)
 {
-	if (gethostname(buf, sizeof(buf)) == -1) {
+	if (gethostname(buf, sizeof(buf)) < 0) {
 		fprintf(stderr, "gethostbyname: %s\n", strerror(errno));
 		return NULL;
 	}