iscsi-target: Fix uninitialized usage of cmd->pad_bytes

This patch fixes an uninitialized usage of cmd->pad_bytes inside of
iscsit_handle_text_cmd() introduced during a v4.1 change to use cmd
members instead of local pad_bytes variables.
Reported-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

drivers/target/iscsi/iscsi_target.c

@@ -1857,7 +1857,7 @@ static int iscsit_handle_text_cmd(
 	char *text_ptr, *text_in;
 	int cmdsn_ret, niov = 0, rx_got, rx_size;
 	u32 checksum = 0, data_crc = 0, payload_length;
-	u32 padding = 0, text_length = 0;
+	u32 padding = 0, pad_bytes = 0, text_length = 0;
 	struct iscsi_cmd *cmd;
 	struct kvec iov[3];
 	struct iscsi_text *hdr;
@@ -1896,7 +1896,7 @@ static int iscsit_handle_text_cmd(
 
 		padding = ((-payload_length) & 3);
 		if (padding != 0) {
-			iov[niov].iov_base = cmd->pad_bytes;
+			iov[niov].iov_base = &pad_bytes;
 			iov[niov++].iov_len  = padding;
 			rx_size += padding;
 			pr_debug("Receiving %u additional bytes"
@@ -1917,7 +1917,7 @@ static int iscsit_handle_text_cmd(
 		if (conn->conn_ops->DataDigest) {
 			iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
 					text_in, text_length,
-					padding, cmd->pad_bytes,
+					padding, (u8 *)&pad_bytes,
 					(u8 *)&data_crc);
 
 			if (checksum != data_crc) {