revision.c: whitespace fix

Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/revision.c b/revision.c
index e75079a..71f0bea 100644
--- a/revision.c
+++ b/revision.c
@@ -489,7 +489,7 @@
 			p->object.flags |= SEEN;
 			insert_by_date_cached(p, list, cached_base, cache_ptr);
 		}
-		if(revs->first_parent_only)
+		if (revs->first_parent_only)
 			break;
 	}
 	return 0;