pack-bitmap.c: rename "idx_name" to "bitmap_name"

In "open_pack_bitmap_1()" and "open_midx_bitmap_1()" we use
a var named "idx_name" to represent the bitmap filename which
is computed by "midx_bitmap_filename()" or "pack_bitmap_filename()"
before we open it.

There may bring some confusion in this "idx_name" naming, which
might lead us to think of ".idx "or" multi-pack-index" files,
although bitmap is essentially can be understood as a kind of index,
let's define this name a little more accurate here.

Signed-off-by: Teng Long <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: dyrone

pack-bitmap.c

@@ -314,10 +314,10 @@ static int open_midx_bitmap_1(struct bitmap_index *bitmap_git,
 			      struct multi_pack_index *midx)
 {
 	struct stat st;
-	char *idx_name = midx_bitmap_filename(midx);
-	int fd = git_open(idx_name);
+	char *bitmap_name = midx_bitmap_filename(midx);
+	int fd = git_open(bitmap_name);
 
-	free(idx_name);
+	free(bitmap_name);
 
 	if (fd < 0)
 		return -1;
@@ -369,14 +369,14 @@ static int open_pack_bitmap_1(struct bitmap_index *bitmap_git, struct packed_git
 {
 	int fd;
 	struct stat st;
-	char *idx_name;
+	char *bitmap_name;
 
 	if (open_pack_index(packfile))
 		return -1;
 
-	idx_name = pack_bitmap_filename(packfile);
-	fd = git_open(idx_name);
-	free(idx_name);
+	bitmap_name = pack_bitmap_filename(packfile);
+	fd = git_open(bitmap_name);
+	free(bitmap_name);
 
 	if (fd < 0)
 		return -1;