builtin/apply.c: fix a memleak

oldlines is allocated earlier in the function and also freed on the
successful code path.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/apply.c

@@ -2776,7 +2776,8 @@ static int apply_one_fragment(struct image *img, struct fragment *frag,
 		default:
 			if (apply_verbosely)
 				error(_("invalid start of line: '%c'"), first);
-			return -1;
+			applied_pos = -1;
+			goto out;
 		}
 		if (added_blank_line) {
 			if (!new_blank_lines_at_end)
@@ -2915,6 +2916,7 @@ static int apply_one_fragment(struct image *img, struct fragment *frag,
 			      (int)(old - oldlines), oldlines);
 	}
 
+out:
 	free(oldlines);
 	strbuf_release(&newlines);
 	free(preimage.line_allocated);