runtime: remove unused variable

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/128230047

diff --git a/src/pkg/runtime/atomic_arm.c b/src/pkg/runtime/atomic_arm.c
index 537bf18331ca14202c5e6476cc99a8f50950ac1a..0cb823bb48e5f93f9b3d58fd11d3c2dd09cc8cf4 100644 (file)
--- a/src/pkg/runtime/atomic_arm.c
+++ b/src/pkg/runtime/atomic_arm.c
@@ -172,7 +172,7 @@ runtime·atomicstore64(uint64 volatile *addr, uint64 v)
 void
 runtime·atomicor8(byte volatile *addr, byte v)
 {
-       uint32 *addr32, old, word, shift;
+       uint32 *addr32, old, word;
 
        // Align down to 4 bytes and use 32-bit CAS.
        addr32 = (uint32*)((uintptr)addr & ~3);