net: microchip: vcap: Fix initialization of value and mask

Fix the following smatch warning:

smatch warnings:
drivers/net/ethernet/microchip/vcap/vcap_api_debugfs.c:103 vcap_debugfs_show_rule_keyfield() error: uninitialized symbol 'value'.
drivers/net/ethernet/microchip/vcap/vcap_api_debugfs.c:106 vcap_debugfs_show_rule_keyfield() error: uninitialized symbol 'mask'.

In case the vcap field was VCAP_FIELD_U128 and the key was different
than IP6_S/DIP then the value and mask were not initialized, therefore
initialize them.

Fixes: 610c32b2ce66 ("net: microchip: vcap: Add vcap_get_rule")
Reported-by: kernel test robot <[e-mail]>
Reported-by: Dan Carpenter <[e-mail]>
Reviewed-by: Saeed Mahameed <[e-mail]>
Signed-off-by: Horatiu Vultur <[e-mail]>
Reviewed-by: Michal Swiatkowski <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/microchip/vcap/vcap_api_debugfs.c

···
 		hex = true;
 		break;
 	case VCAP_FIELD_U128:
+		value = data->u128.value;
+		mask = data->u128.mask;
 		if (key == VCAP_KF_L3_IP6_SIP || key == VCAP_KF_L3_IP6_DIP) {
 			u8 nvalue[16], nmask[16];