[PATCH] Fix warnings when compiling with -DNDEBUG

[Peter Collingbourne]

http://llvm-reviews.chandlerc.com/D1704

Files:
  src/mutex.cpp

Index: src/mutex.cpp
===================================================================
--- src/mutex.cpp
+++ src/mutex.cpp
@@ -42,6 +42,7 @@
 mutex::unlock() _NOEXCEPT
 {
     int ec = pthread_mutex_unlock(&__m_);
+    (void)ec;
     assert(ec == 0);
 }
 
@@ -79,6 +80,7 @@
 recursive_mutex::~recursive_mutex()
 {
     int e = pthread_mutex_destroy(&__m_);
+    (void)e;
     assert(e == 0);
 }
 
@@ -94,6 +96,7 @@
 recursive_mutex::unlock() _NOEXCEPT
 {
     int e = pthread_mutex_unlock(&__m_);
+    (void)e;
     assert(e == 0);
 }
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