make hget handle code 303 (see other) responses

Reference: /n/sources/patch/applied/hget303
Date: Sun Mar 16 22:10:52 CET 2008
Signed-off-by: bichued@gmail.com

--- /sys/src/cmd/hget.c	Sun Mar 16 22:05:56 2008
+++ /sys/src/cmd/hget.c	Sun Mar 16 22:05:46 2008
@@ -447,6 +447,7 @@
 
 		case 301:	/* Moved Permanently */
 		case 302:	/* Moved Temporarily */
+		case 303:	/* See Other */
 			redirect = 1;
 			u->postbody = nil;
 			break;