userspace/libwr: zero sfp->rx_wl when wl_txrx not present in SFP params

Zero also sfp->rx_wl (not only sfp->tx_wl) when wl_txrx not found for specific
SFP entry.

Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

userspace/libwr/i2c_sfp.c

@@ -634,6 +634,7 @@ int shw_sfp_read_db(void)
 			__err_msg(index, "wl_txrx", NULL);
 		if (sscanf(s, "%i+%i", &sfp->tx_wl, &sfp->rx_wl) != 2) {
 			sfp->tx_wl = 0;
+			sfp->rx_wl = 0;
 			__err_msg(index, "wl_txrx", s);
 		}