[bug report] mt76: mt7915: add support for continuous tx in testmode

[Dan Carpenter <dan.carpenter@oracle.com>]

Hello Shayne Chen,

The patch 3f0caa3cbf94: "mt76: mt7915: add support for continuous tx
in testmode" from Jan 5, 2021, leads to the following static checker
warning:

	drivers/net/wireless/mediatek/mt76/mt7915/testmode.c:597 mt7915_tm_set_tx_cont()
	error: uninitialized symbol 'mode'.

drivers/net/wireless/mediatek/mt76/mt7915/testmode.c
   583                  break;
   584          case MT76_TM_TX_MODE_HE_EXT_SU:
   585                  mode = MT_PHY_TYPE_HE_EXT_SU;
   586                  break;
   587          case MT76_TM_TX_MODE_HE_TB:
   588                  mode = MT_PHY_TYPE_HE_TB;
   589                  break;
   590          case MT76_TM_TX_MODE_HE_MU:
   591                  mode = MT_PHY_TYPE_HE_MU;
   592                  break;
   593          default:

"mode" is uninitialized on the default path.

   594                  break;
   595          }
   596  
   597          rateval =  mode << 6 | rate_idx;
                           ^^^^^^^^^

   598          tx_cont->rateval = cpu_to_le16(rateval);
   599  
   600  out:
   601          if (!en) {
   602                  int ret;
   603  

regards,
dan carpenter