Add the missing unlock before return from function mcp23s08_irq()
in the error handling case.

v1-->v2:
   remove the "return IRQ_HANDLED" line

Fixes: 897120d41e7a ("pinctrl: mcp23s08: fix race condition in irq handler")
Reported-by: Hulk Robot <redacted>
Signed-off-by: Zou Wei <redacted>
---
 drivers/pinctrl/pinctrl-mcp23s08.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pinctrl/pinctrl-mcp23s08.c b/drivers/pinctrl/pinctrl-mcp23s08.c
index 799d596..d025957 100644
--- a/drivers/pinctrl/pinctrl-mcp23s08.c
+++ b/drivers/pinctrl/pinctrl-mcp23s08.c

@@ -353,7 +353,7 @@ static irqreturn_t mcp23s08_irq(int irq, void *data)
 
 	if (intf == 0) {
 		/* There is no interrupt pending */
-		return IRQ_HANDLED;
+		goto unlock;
 	}
 
 	if (mcp_read(mcp, MCP_INTCAP, &intcap))

-- 
2.6.2