iwlwifi: dbg_ini: don't skip a TX FIFO when dumping

Before we start looping over the internal TX FIFOs increase the fifo
number, but that's incorrect and causes a FIFO to be skipped.  This is
probably due to a copy and paste from the previous loop.
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/fw/dbg.c

@@ -1230,13 +1230,15 @@ static bool iwl_ini_txf_iter(struct iwl_fw_runtime *fwrt,
 			iter->lmac = 0;
 	}
 
-	if (!iter->internal_txf)
+	if (!iter->internal_txf) {
 		for (iter->fifo++; iter->fifo < txf_num; iter->fifo++) {
 			iter->fifo_size =
 				cfg->lmac[iter->lmac].txfifo_size[iter->fifo];
 			if (iter->fifo_size && (lmac_bitmap & BIT(iter->fifo)))
 				return true;
 		}
+		iter->fifo--;
+	}
 
 	iter->internal_txf = 1;