staging: octeon: check request_irq() return value

request_irq() may fail, if so propagate error code.

Signed-off-by: Kulikov Vasiliy <segooon@gmail.com>
Acked-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/octeon/ethernet-spi.c

@@ -294,6 +294,8 @@ int cvm_oct_spi_init(struct net_device *dev)
 	if (number_spi_ports == 0) {
 		r = request_irq(OCTEON_IRQ_RML, cvm_oct_spi_rml_interrupt,
 				IRQF_SHARED, "SPI", &number_spi_ports);
+		if (r)
+			return r;
 	}
 	number_spi_ports++;