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git/fs: remove trailing null bytes from parent file (thanks mcf)

due to the way the size of buf was calculated, the parent
file had one trailing null byte for each parent. also, while
we're here, replace the sprint with seprint, and compute the
size from how much we printed in.

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

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

@@ -377,18 +377,19 @@

 static void

 readcommitparent(Req *r, Object *o)

 {

-	char *buf, *p;

+	char *buf, *p, *e;

 	int i, n;

-	n = o->commit->nparent * (40 + 2);

+	/* 40 bytes per hash, 1 per nl, 1 for terminator */

+	n = o->commit->nparent * (40 + 1) + 1;

 	buf = emalloc(n);

 	p = buf;

+	e = buf + n;

 	for (i = 0; i < o->commit->nparent; i++)

-		p += sprint(p, "%H\n", o->commit->parent[i]);

-	readbuf(r, buf, n);

+		p = seprint(p, e, "%H\n", o->commit->parent[i]);

+	readbuf(r, buf, p - buf);

 	free(buf);

 }

-

 static void

 gitattach(Req *r)

-- 

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