[IP] AddrCountPrefixBits(): Fix loop condition (#4556)

Properly handle BitTest reaching 0.

CORE-18225

diff --git a/sdk/lib/drivers/ip/network/address.c b/sdk/lib/drivers/ip/network/address.c
index 6ddbfd9..27906f6 100644 (file)
--- a/sdk/lib/drivers/ip/network/address.c
+++ b/sdk/lib/drivers/ip/network/address.c
@@ -71,7 +71,7 @@ UINT AddrCountPrefixBits( PIP_ADDRESS Netmask ) {
 
        ULONG TestMask = IPv4NToHl(Netmask->Address.IPv4Address);
 
-       while( (BitTest & TestMask) == BitTest ) {
+       while ((BitTest & TestMask) != 0) {
            Prefix++;
            BitTest >>= 1;
        }