Fix up some fallout from "setup_git_directory()" cleanups

git-ls-files was broken by the setup_git_directory() calling changes,
because I had missed the fact that the "prefix" variable in that file was
static to the whole file, and unlike git-ls-tree (where I had fixed it
up), it ended up using two different variables with the same name
depending on what the scoping happened to be.

This fixes it up properly (by just removing the static variable, and
passing the automatic one around properly), and git-ls-files should work
again.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

builtin-ls-files.c

diff --git a/builtin-ls-files.c b/builtin-ls-files.c
index 79ffe8f..11386c4 100644
--- a/builtin-ls-files.c
+++ b/builtin-ls-files.c
@@ -24,7 +24,6 @@
 static int line_terminator = '\n';
 
 static int prefix_len = 0, prefix_offset = 0;
-static const char *prefix = NULL;
 static const char **pathspec = NULL;
 static int error_unmatch = 0;
 static char *ps_matched = NULL;
@@ -207,7 +206,7 @@
 	}
 }
 
-static void show_files(struct dir_struct *dir)
+static void show_files(struct dir_struct *dir, const char *prefix)
 {
 	int i;
 
@@ -253,7 +252,7 @@
 /*
  * Prune the index to only contain stuff starting with "prefix"
  */
-static void prune_cache(void)
+static void prune_cache(const char *prefix)
 {
 	int pos = cache_name_pos(prefix, prefix_len);
 	unsigned int first, last;
@@ -276,7 +275,7 @@
 	active_nr = last;
 }
 
-static void verify_pathspec(void)
+static const char *verify_pathspec(const char *prefix)
 {
 	const char **p, *n, *prev;
 	char *real_prefix;
@@ -313,7 +312,7 @@
 		memcpy(real_prefix, prev, max);
 		real_prefix[max] = 0;
 	}
-	prefix = real_prefix;
+	return real_prefix;
 }
 
 static const char ls_files_usage[] =
@@ -453,7 +452,7 @@
 
 	/* Verify that the pathspec matches the prefix */
 	if (pathspec)
-		verify_pathspec();
+		prefix = verify_pathspec(prefix);
 
 	/* Treat unmatching pathspec elements as errors */
 	if (pathspec && error_unmatch) {
@@ -476,8 +475,8 @@
 
 	read_cache();
 	if (prefix)
-		prune_cache();
-	show_files(&dir);
+		prune_cache(prefix);
+	show_files(&dir, prefix);
 
 	if (ps_matched) {
 		/* We need to make sure all pathspec matched otherwise