net: clear heap allocation for ethtool_get_regs()

commit b7c7d01a upstream.

There is a conflict between commit b00916b1 and a77f5db3. This patch resolves
the conflict by clearing the heap allocation in ethtool_get_regs().
Signed-off-by: Eugene Teo <eugeneteo@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

net/core/ethtool.c

@@ -817,7 +817,7 @@ static int ethtool_get_regs(struct net_device *dev, char __user *useraddr)
 	if (regs.len > reglen)
 		regs.len = reglen;
 
-	regbuf = vmalloc(reglen);
+	regbuf = vzalloc(reglen);
 	if (!regbuf)
 		return -ENOMEM;