NFC: netlink: Use error code from nfc_activate_target()

It looks like a typo to assign a return code to a variable which is not
used. Found due to a compiler warning:

net/nfc/netlink.c: In function ‘nfc_genl_activate_target’:
net/nfc/netlink.c:903:6: warning: variable ‘rc’ set but not used [-Wunused-but-set-variable]
  int rc;
        ^~
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

net/nfc/netlink.c

@@ -922,7 +922,7 @@ static int nfc_genl_activate_target(struct sk_buff *skb, struct genl_info *info)
 	rc = nfc_activate_target(dev, target_idx, protocol);
 
 	nfc_put_device(dev);
-	return 0;
+	return rc;
 }
 
 static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)