From 9a33f41180a119b80a6fdd1aafd341a1ee71b2c0 Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Fri, 3 Mar 2017 15:09:44 -0600
Subject: [PATCH] Kinetis PINIRQ: Improper type for return value.

---
 arch/arm/src/kinetis/kinetis_pinirq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/src/kinetis/kinetis_pinirq.c b/arch/arm/src/kinetis/kinetis_pinirq.c
index bf1b2af6ba..4d2c31ba7c 100644
--- a/arch/arm/src/kinetis/kinetis_pinirq.c
+++ b/arch/arm/src/kinetis/kinetis_pinirq.c
@@ -325,7 +325,7 @@ int kinetis_pinirqattach(uint32_t pinset, xcpt_t pinisr, void *arg)
 #endif
       default:
         leave_critical_section(flags);
-        return NULL;
+        return -EINVAL;
     }
 
    /* Get the old PIN ISR and set the new PIN ISR */