net: tftpput: Support selecting get/put for tftp

TftpStart should support starting either a get or a put.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/net/tftp.c b/net/tftp.c
index 6d46bbb..7e3bb3d 100644
--- a/net/tftp.c
+++ b/net/tftp.c
@@ -595,8 +595,7 @@
 }
 
 
-void
-TftpStart(void)
+void TftpStart(enum proto_t protocol)
 {
 	char *ep;             /* Environment pointer */