Mark this variable as used.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110667 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/System/RWMutex.cpp b/lib/System/RWMutex.cpp
index 5a33364..deb0470 100644
--- a/lib/System/RWMutex.cpp
+++ b/lib/System/RWMutex.cpp
@@ -73,6 +73,7 @@
 
     // Initialize the rwlock
     int errorcode = pthread_rwlock_init(rwlock, NULL);
+    (void)errorcode;
     assert(errorcode == 0);
 
     // Assign the data member