diff-files: avoid negative exit value

If loading the index fails, we print an error and then return "-1" from
the function. But since this is a builtin, we end up with exit(-1),
which produces odd results since program exit codes are unsigned.
Because of integer conversion, it usually becomes 255, which is at least
still an error, but values above 128 are usually interpreted as signal
death.

Since we know the program is exiting immediately, we can just replace
the error return with a die().

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 2 insertions, 6 deletions

diff --git a/builtin/diff-files.c b/builtin/diff-files.c
index 50330b8dd2..2e3e948583 100644
--- a/builtin/diff-files.c
+++ b/builtin/diff-files.c
@@ -80,14 +80,10 @@ int cmd_diff_files(int argc, const char **argv, const char *prefix)
 	    (rev.diffopt.output_format & DIFF_FORMAT_PATCH))
 		diff_merges_set_dense_combined_if_unset(&rev);
 
-	if (repo_read_index_preload(the_repository, &rev.diffopt.pathspec, 0) < 0) {
-		perror("repo_read_index_preload");
-		result = -1;
-		goto cleanup;
-	}
+	if (repo_read_index_preload(the_repository, &rev.diffopt.pathspec, 0) < 0)
+		die_errno("repo_read_index_preload");
 	result = run_diff_files(&rev, options);
 	result = diff_result_code(&rev.diffopt, result);
-cleanup:
 	release_revisions(&rev);
 	return result;
 }