net: tftp: Fix TFTP Transfer Size data type

The TFTP transfer size is unsigned integer, update the data type
and print formating string accordingly to prevent an overflow in
case the file size is longer than 2 GiB.

TFTP transfer of a 3 GiB file, before (wrong) and after (right):
Loading: #################################################  16 EiB
Loading: ##################################################  3 GiB

Signed-off-by: Yuya Hamamachi <yuya.hamamachi.sx@renesas.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>

net/tftp.c

@@ -94,7 +94,7 @@ static int	tftp_state;
 static ulong	tftp_load_addr;
 #ifdef CONFIG_TFTP_TSIZE
 /* The file size reported by the server */
-static int	tftp_tsize;
+static unsigned int tftp_tsize;
 /* The number of hashes we printed */
 static short	tftp_tsize_num_hash;
 #endif
@@ -573,7 +573,7 @@ static void tftp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
 			if (strcasecmp((char *)pkt + i, "tsize") == 0) {
 				tftp_tsize = dectoul((char *)pkt + i + 6,
 						     NULL);
-				debug("size = %s, %d\n",
+				debug("size = %s, %u\n",
 				      (char *)pkt + i + 6, tftp_tsize);
 			}
 #endif