net: ti: icssg-prueth: Add missing icss_iep_put to error path

Analogously to prueth_remove, just also taking care for NULL'ing the
iep pointers.

Fixes: 186734c1 ("net: ti: icssg-prueth: add packet timestamping and ptp support")
Fixes: 443a2367 ("net: ti: icssg-prueth: am65x SR2.0 add 10M full duplex support")
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>
Reviewed-by: MD Danish Anwar <danishanwar@ti.com>
Reviewed-by: Roger Quadros <rogerq@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/ti/icssg/icssg_prueth.c

@@ -2105,10 +2105,7 @@ static int prueth_probe(struct platform_device *pdev)
 	prueth->iep1 = icss_iep_get_idx(np, 1);
 	if (IS_ERR(prueth->iep1)) {
 		ret = dev_err_probe(dev, PTR_ERR(prueth->iep1), "iep1 get failed\n");
-		icss_iep_put(prueth->iep0);
-		prueth->iep0 = NULL;
-		prueth->iep1 = NULL;
-		goto free_pool;
+		goto put_iep0;
 	}
 
 	if (prueth->pdata.quirk_10m_link_issue) {
@@ -2205,6 +2202,12 @@ static int prueth_probe(struct platform_device *pdev)
 exit_iep:
 	if (prueth->pdata.quirk_10m_link_issue)
 		icss_iep_exit_fw(prueth->iep1);
+	icss_iep_put(prueth->iep1);
+
+put_iep0:
+	icss_iep_put(prueth->iep0);
+	prueth->iep0 = NULL;
+	prueth->iep1 = NULL;
 
 free_pool:
 	gen_pool_free(prueth->sram_pool,