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git/walk: fix usage on new repo

--- a/sys/src/cmd/git/walk.c

+++ b/sys/src/cmd/git/walk.c

@@ -30,8 +30,7 @@

 int quiet;

 int useindex;

 int printflg;

-char *base = "HEAD";

-char *bdir;

+char *bdir = ".git/fs/HEAD/tree";

 char *rstr = "R ";

 char *tstr = "T ";

 char *mstr = "M ";

@@ -218,7 +217,7 @@

 void

 main(int argc, char **argv)

 {

-	char *rpath, *tpath, *bpath, buf[8], repo[512];

+	char *rpath, *tpath, *bpath, *base, buf[8], repo[512];

 	char *p, *e;

 	int i, dirty;

 	Wres r;

@@ -250,6 +249,9 @@

 	case 'b':

 		useindex = 0;

 		base = EARGF(usage());

+		if(resolveref(&h, base) == -1)

+			sysfatal("no such ref '%s'", base);

+		bdir = smprint(".git/fs/object/%H/tree", h);

 		break;

 	default:

 		usage();

@@ -262,9 +264,6 @@

 		sysfatal("chdir: %r");

 	if(access(".git/fs/ctl", AEXIST) != 0)

 		sysfatal("no running git/fs");

-	if(resolveref(&h, base) == -1)

-		sysfatal("no such ref '%s'", base);

-	bdir = smprint(".git/fs/object/%H/tree", h);

 	dirty = 0;

 	memset(&r, 0, sizeof(r));

 	if(printflg == 0)