Staging: vt6655: Correct unsigned bound issue

uNodeIndex is unsigned, check whether it is within bounds instead.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/staging/vt6656/rxtx.c b/drivers/staging/vt6656/rxtx.c
index 94ddf8b..d9fa36c 100644
--- a/drivers/staging/vt6656/rxtx.c
+++ b/drivers/staging/vt6656/rxtx.c
@@ -3153,7 +3153,7 @@
     }
 
     if (pDevice->bEnableHostWEP) {
-        if (uNodeIndex >= 0) {
+        if (uNodeIndex < MAX_NODE_NUM + 1) {
             pTransmitKey = &STempKey;
             pTransmitKey->byCipherSuite = pMgmt->sNodeDBTable[uNodeIndex].byCipherSuite;
             pTransmitKey->dwKeyIndex = pMgmt->sNodeDBTable[uNodeIndex].dwKeyIndex;