init_buffer(): Kill buf pointer

We don't need it, it's possible to assign the block of memory to bufp

Signed-off-by: Luiz Fernando N. Capitulino <lcapitulino@mandriva.com.br>
Signed-off-by: Junio C Hamano <junkio@cox.net>

builtin-commit-tree.c

@@ -16,9 +16,8 @@
  */
 static void init_buffer(char **bufp, unsigned int *sizep)
 {
-	char *buf = xmalloc(BLOCKING);
+	*bufp = xmalloc(BLOCKING);
 	*sizep = 0;
-	*bufp = buf;
 }
 
 static void add_buffer(char **bufp, unsigned int *sizep, const char *fmt, ...)