Convert GIT_SHA1_HEXSZ used for allocation to GIT_MAX_HEXSZ

Since we will likely be introducing a new hash function at some point,
and that hash function might be longer than 40 hex characters, use the
constant GIT_MAX_HEXSZ, which is designed to be suitable for
allocations, instead of GIT_SHA1_HEXSZ.  This will ease the transition
down the line by distinguishing between places where we need to allocate
memory suitable for the largest hash from those where we need to handle
the current hash.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/builtin/blame.c b/builtin/blame.c
index f7aa95f..07506a3 100644
--- a/builtin/blame.c
+++ b/builtin/blame.c
@@ -1890,7 +1890,7 @@ static void emit_porcelain(struct scoreboard *sb, struct blame_entry *ent,
 	int cnt;
 	const char *cp;
 	struct origin *suspect = ent->suspect;
-	char hex[GIT_SHA1_HEXSZ + 1];
+	char hex[GIT_MAX_HEXSZ + 1];
 
 	oid_to_hex_r(hex, &suspect->commit->object.oid);
 	printf("%s %d %d %d\n",
@@ -1928,7 +1928,7 @@ static void emit_other(struct scoreboard *sb, struct blame_entry *ent, int opt)
 	const char *cp;
 	struct origin *suspect = ent->suspect;
 	struct commit_info ci;
-	char hex[GIT_SHA1_HEXSZ + 1];
+	char hex[GIT_MAX_HEXSZ + 1];
 	int show_raw_time = !!(opt & OUTPUT_RAW_TIMESTAMP);
 
 	get_commit_info(suspect->commit, &ci, 1);
diff --git a/builtin/merge-index.c b/builtin/merge-index.c
index 2d1b6db..c99443b 100644
--- a/builtin/merge-index.c
+++ b/builtin/merge-index.c
@@ -9,7 +9,7 @@ static int merge_entry(int pos, const char *path)
 {
 	int found;
 	const char *arguments[] = { pgm, "", "", "", path, "", "", "", NULL };
-	char hexbuf[4][GIT_SHA1_HEXSZ + 1];
+	char hexbuf[4][GIT_MAX_HEXSZ + 1];
 	char ownbuf[4][60];
 
 	if (pos >= active_nr)
diff --git a/builtin/merge.c b/builtin/merge.c
index 7554b8d..a2cceea 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -1296,7 +1296,7 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
 	if (verify_signatures) {
 		for (p = remoteheads; p; p = p->next) {
 			struct commit *commit = p->item;
-			char hex[GIT_SHA1_HEXSZ + 1];
+			char hex[GIT_MAX_HEXSZ + 1];
 			struct signature_check signature_check;
 			memset(&signature_check, 0, sizeof(signature_check));
 
diff --git a/builtin/rev-list.c b/builtin/rev-list.c
index 0aa93d5..bcf77f0 100644
--- a/builtin/rev-list.c
+++ b/builtin/rev-list.c
@@ -212,7 +212,7 @@ static void print_var_int(const char *var, int val)
 static int show_bisect_vars(struct rev_list_info *info, int reaches, int all)
 {
 	int cnt, flags = info->flags;
-	char hex[GIT_SHA1_HEXSZ + 1] = "";
+	char hex[GIT_MAX_HEXSZ + 1] = "";
 	struct commit_list *tried;
 	struct rev_info *revs = info->revs;