[PATCH 1/3] drop casts from users EMPTY_TREE_SHA1_BIN

[Jeff King <peff@peff.net>]

This macro already evaluates to the correct type, as it
casts the string literal to "unsigned char *" itself
(and callers who want the literal can use the _LITERAL
form).

Signed-off-by: Jeff King <peff@peff.net>
---
 builtin/diff.c    |    2 +-
 merge-recursive.c |    2 +-
 sequencer.c       |    2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/builtin/diff.c b/builtin/diff.c
index 424c815..9069dc4 100644
--- a/builtin/diff.c
+++ b/builtin/diff.c
@@ -327,7 +327,7 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
 				add_head_to_pending(&rev);
 				if (!rev.pending.nr) {
 					struct tree *tree;
-					tree = lookup_tree((const unsigned char*)EMPTY_TREE_SHA1_BIN);
+					tree = lookup_tree(EMPTY_TREE_SHA1_BIN);
 					add_pending_object(&rev, &tree->object, "HEAD");
 				}
 				break;
diff --git a/merge-recursive.c b/merge-recursive.c
index 6479a60..318d32e 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -1914,7 +1914,7 @@ int merge_recursive(struct merge_options *o,
 		/* if there is no common ancestor, use an empty tree */
 		struct tree *tree;
 
-		tree = lookup_tree((const unsigned char *)EMPTY_TREE_SHA1_BIN);
+		tree = lookup_tree(EMPTY_TREE_SHA1_BIN);
 		merged_common_ancestors = make_virtual_commit(tree, "ancestor");
 	}
 
diff --git a/sequencer.c b/sequencer.c
index a37846a..4307364 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -164,7 +164,7 @@ static void write_message(struct strbuf *msgbuf, const char *filename)
 
 static struct tree *empty_tree(void)
 {
-	return lookup_tree((const unsigned char *)EMPTY_TREE_SHA1_BIN);
+	return lookup_tree(EMPTY_TREE_SHA1_BIN);
 }
 
 static int error_dirty_index(struct replay_opts *opts)
-- 
1.7.10.rc0.9.gdcbe9