net: ethtool: fix __ethtool_dev_mm_supported() implementation

The MAC Merge layer is supported when ops->get_mm() returns 0.
The implementation was changed during review, and in this process, a bug
was introduced.

Link: https://lore.kernel.org/netdev/[email protected]/
Fixes: 04692c9 ("net: ethtool: netlink: retrieve stats from multiple sources (eMAC, pMAC)")
Signed-off-by: Vladimir Oltean <[email protected]>
Reviewed-by: Ferenc Fejes <[email protected]>
Link: https://lore.kernel.org/all/[email protected]/
Signed-off-by: Jakub Kicinski <[email protected]>

Author: vladimiroltean

net/ethtool/mm.c

@@ -247,5 +247,5 @@ bool __ethtool_dev_mm_supported(struct net_device *dev)
 	if (ops && ops->get_mm)
 		ret = ops->get_mm(dev, &state);
 
-	return !!ret;
+	return !ret;
 }