fsl/fman: fix dtsec_set_tx_pause_frames

Fix a bug introduced in e06a03bd (fsl/fman: fix the pause_time test)
When pause_time is set to '0' - pause frames are disabled and
there's no need to apply dTSEC-A003 Errata workaround.
Signed-off-by: Igal Liberman <igal.liberman@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/fman/fman_dtsec.c

@@ -932,15 +932,14 @@ int dtsec_set_tx_pause_frames(struct fman_mac *dtsec,
 	if (!is_init_done(dtsec->dtsec_drv_param))
 		return -EINVAL;
 
-	/* FM_BAD_TX_TS_IN_B_2_B_ERRATA_DTSEC_A003 Errata workaround */
-	if (dtsec->fm_rev_info.major == 2)
-		if (pause_time <= 320) {
+	if (pause_time) {
+		/* FM_BAD_TX_TS_IN_B_2_B_ERRATA_DTSEC_A003 Errata workaround */
+		if (dtsec->fm_rev_info.major == 2 && pause_time <= 320) {
 			pr_warn("pause-time: %d illegal.Should be > 320\n",
 				pause_time);
 			return -EINVAL;
 		}
 
-	if (pause_time) {
 		ptv = ioread32be(&regs->ptv);
 		ptv &= PTV_PTE_MASK;
 		ptv |= pause_time & PTV_PT_MASK;