[PATCH v3 1/3: scsi: jazz_esp: add IRQ check

The driver neglects to check the result of platform_get_irq()'s call and
blithely passes the negative error codes to request_irq() (which takes
*unsigned* IRQ #), causing it to fail with -EINVAL, overriding the real
error code.  Stop  calling request_irq() with the invalid IRQ #s.

Fixes: 352e921f0dd4 ("[SCSI] jazz_esp: converted to use esp_core")
Signed-off-by: Sergey Shtylyov <redacted>

---
Changes in version 2:
- clarified the description.

 drivers/scsi/jazz_esp.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Index: scsi/drivers/scsi/jazz_esp.c
===================================================================

--- scsi.orig/drivers/scsi/jazz_esp.c
+++ scsi/drivers/scsi/jazz_esp.c

@@ -143,7 +143,9 @@ static int esp_jazz_probe(struct platfor
 	if (!esp->command_block)
 		goto fail_unmap_regs;
 
-	host->irq = platform_get_irq(dev, 0);
+	host->irq = err = platform_get_irq(dev, 0);
+	if (err < 0)
+		goto fail_unmap_command_block;
 	err = request_irq(host->irq, scsi_esp_intr, IRQF_SHARED, "ESP", esp);
 	if (err < 0)
 		goto fail_unmap_command_block;