'git foo' program identifies itself without dash in die() messages

This is a mechanical conversion of all '*.c' files with:

	s/((?:die|error|warning)\("git)-(\S+:)/$1 $2/;

The result was manually inspected and no false positive was found.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/tree-diff.c b/tree-diff.c
index bbb126f..9f67af6 100644
--- a/tree-diff.c
+++ b/tree-diff.c
@@ -303,7 +303,7 @@
 			update_tree_entry(t2);
 			continue;
 		}
-		die("git-diff-tree: internal error");
+		die("git diff-tree: internal error");
 	}
 	return 0;
 }