spi: zynq_qspi: Fixed incorrect return value error

This patch replaced "return 0" with "return status" to fix the
incorrect return value error reported by the coverity.

Signed-off-by: Vipul Kumar <vipul.kumar@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

drivers/spi/zynq_qspi.c

@@ -774,7 +774,7 @@ static int zynq_qspi_transfer(struct zynq_qspi_priv *priv)
 		break;
 	}
 
-	return 0;
+	return status;
 }
 
 static int zynq_qspi_claim_bus(struct udevice *dev)