Call git_pathdup() rather than xstrdup(git_path("..."))

In addition to updating the two xstrdup(git_path("...")) call sites
with git_pathdup(), we also fix a memory leak by freeing the memory
allocated to the ADD_EDIT.patch 'file' in the edit_patch() function.

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

bisect.c

@@ -833,7 +833,7 @@ static int check_ancestors(const char *prefix)
  */
 static void check_good_are_ancestors_of_bad(const char *prefix, int no_checkout)
 {
-	char *filename = xstrdup(git_path("BISECT_ANCESTORS_OK"));
+	char *filename = git_pathdup("BISECT_ANCESTORS_OK");
 	struct stat st;
 	int fd;
 

builtin/add.c

@@ -260,7 +260,7 @@ int interactive_add(int argc, const char **argv, const char *prefix, int patch)
 
 static int edit_patch(int argc, const char **argv, const char *prefix)
 {
-	char *file = xstrdup(git_path("ADD_EDIT.patch"));
+	char *file = git_pathdup("ADD_EDIT.patch");
 	const char *apply_argv[] = { "apply", "--recount", "--cached",
 		NULL, NULL };
 	struct child_process child;
@@ -303,6 +303,7 @@ static int edit_patch(int argc, const char **argv, const char *prefix)
 		die (_("Could not apply '%s'"), file);
 
 	unlink(file);
+	free(file);
 	return 0;
 }