net: Export auto_load, use it in rarp

The rarp code includes another instance of the auto_load logic, so call
what is now net_auto_load() instead.

This also fixes an incorrect call to TftpStart() which was never seen
since apparently no boards enable rarp.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/net/bootp.c b/net/bootp.c
index b703f42..b789eec 100644
--- a/net/bootp.c
+++ b/net/bootp.c
@@ -138,36 +138,6 @@
 	return (curlen);
 }
 
-/*
- * Check if autoload is enabled. If so, use either NFS or TFTP to download
- * the boot file.
- */
-static void auto_load(void)
-{
-	const char *s = getenv("autoload");
-
-	if (s != NULL) {
-		if (*s == 'n') {
-			/*
-			 * Just use BOOTP to configure system;
-			 * Do not use TFTP to load the bootfile.
-			 */
-			NetState = NETLOOP_SUCCESS;
-			return;
-		}
-#if defined(CONFIG_CMD_NFS)
-		if (strcmp(s, "NFS") == 0) {
-			/*
-			 * Use NFS to load the bootfile.
-			 */
-			NfsStart();
-			return;
-		}
-#endif
-	}
-	TftpStart(TFTPGET);
-}
-
 #if !defined(CONFIG_CMD_DHCP)
 
 static void BootpVendorFieldProcess (u8 * ext)
@@ -354,7 +324,7 @@
 
 	debug("Got good BOOTP\n");
 
-	auto_load();
+	net_auto_load();
 }
 #endif
 
@@ -979,7 +949,7 @@
 			dhcp_state = BOUND;
 			printf ("DHCP client bound to address %pI4\n", &NetOurIP);
 
-			auto_load();
+			net_auto_load();
 			return;
 		}
 		break;