[PATCH v3 4/5] pack-bitmap.c: using error() instead of silently returning -1

[Teng Long <dyroneteng@xxxxxxxxx>]

In "open_pack_bitmap_1()" and "open_midx_bitmap_1()", it's better to
return error() instead of "-1" when some unexpected error occurs like
"stat bitmap file failed", "bitmap header is invalid" or "checksum
mismatch", etc.

There are places where we do not replace, such as when the bitmap
does not exist (no bitmap in repository is allowed) or when another
bitmap has already been opened (in which case it should be a warning
rather than an error).

Signed-off-by: Teng Long <dyroneteng@xxxxxxxxx>
---
 pack-bitmap.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/pack-bitmap.c b/pack-bitmap.c
index af0f41833e..a54d5a0c9f 100644
--- a/pack-bitmap.c
+++ b/pack-bitmap.c
@@ -323,7 +323,7 @@ static int open_midx_bitmap_1(struct bitmap_index *bitmap_git,
 
 	if (fstat(fd, &st)) {
 		close(fd);
-		return -1;
+		return error_errno(_("cannot stat bitmap file"));
 	}
 
 	if (bitmap_git->pack || bitmap_git->midx) {
@@ -361,7 +361,7 @@ static int open_midx_bitmap_1(struct bitmap_index *bitmap_git,
 	bitmap_git->map_pos = 0;
 	bitmap_git->map = NULL;
 	bitmap_git->midx = NULL;
-	return -1;
+	return error(_("cannot open midx bitmap file"));
 }
 
 static int open_pack_bitmap_1(struct bitmap_index *bitmap_git, struct packed_git *packfile)
@@ -382,7 +382,7 @@ static int open_pack_bitmap_1(struct bitmap_index *bitmap_git, struct packed_git
 
 	if (fstat(fd, &st)) {
 		close(fd);
-		return -1;
+		return error_errno(_("cannot stat bitmap file"));
 	}
 
 	if (bitmap_git->pack || bitmap_git->midx) {
@@ -394,7 +394,7 @@ static int open_pack_bitmap_1(struct bitmap_index *bitmap_git, struct packed_git
 
 	if (!is_pack_valid(packfile)) {
 		close(fd);
-		return -1;
+		return error(_("packfile is invalid"));
 	}
 
 	bitmap_git->pack = packfile;
@@ -409,7 +409,7 @@ static int open_pack_bitmap_1(struct bitmap_index *bitmap_git, struct packed_git
 		bitmap_git->map_size = 0;
 		bitmap_git->map_pos = 0;
 		bitmap_git->pack = NULL;
-		return -1;
+		return error(_("bitmap header is invalid"));
 	}
 
 	return 0;
-- 
2.35.1.582.g270d558070.dirty