ice: Validate ring existence and its q_vector per VSI

When stopping Tx rings, we use 'i' as an ring array index for looking up
whether the ice_ring exists and have assigned a q_vector. This checks
rings only within a given TC and we need to go through every ring in
VSI. Use 'q_idx' instead.
Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ice/ice_lib.c

@@ -2072,7 +2072,8 @@ ice_vsi_stop_tx_rings(struct ice_vsi *vsi, enum ice_disq_rst_src rst_src,
 		for (i = 0; i < vsi->tc_cfg.tc_info[tc].qcount_tx; i++) {
 			u16 v_idx;
 
-			if (!rings || !rings[i] || !rings[i]->q_vector) {
+			if (!rings || !rings[q_idx] ||
+			    !rings[q_idx]->q_vector) {
 				err = -EINVAL;
 				goto err_out;
 			}