ata: ahci: remove bad free

In the case of a memory allocation error, the ahci_port_start() function
tries to free the `pp' pointer.
This pointer was not dynamically allocated but does in fact point to an
element of the port[] array member of the struct ahci_uc_priv.
Remove the erroneous call to free() to fix this.

Fixes: 4782ac80b02f ("Add AHCI support to u-boot")
Signed-off-by: Vincent Stehlé <vincent.stehle@arm.com>
Cc: Tom Rini <trini@konsulko.com>
Cc: Jason Jin <jason.jin@freescale.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 8058d5f..e593e22 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -463,7 +463,6 @@
 
 	mem = memalign(2048, AHCI_PORT_PRIV_DMA_SZ);
 	if (!mem) {
-		free(pp);
 		printf("%s: No mem for table!\n", __func__);
 		return -ENOMEM;
 	}