Bug 1200623 - Fix FdPrintf.o link error in --disable-optimize builds.…

… r=glandium.

--HG--
extra : rebase_source : 2225f8496f540a01a19477e6e5e77cbc56877dea

memory/replace/logalloc/FdPrintf.cpp

@@ -13,7 +13,6 @@
 #endif
 #include <cstring>
 #include "mozilla/Assertions.h"
-#include "mozilla/unused.h"
 
 /* Template class allowing a limited number of increments on a value */
 template <typename T>
@@ -126,7 +125,9 @@ FdPrintf(intptr_t aFd, const char* aFormat, ...)
   DWORD written;
   WriteFile(reinterpret_cast<HANDLE>(aFd), buf, b - buf, &written, nullptr);
 #else
-  mozilla::unused << write(aFd, buf, b - buf);
+  // Using mozilla::unused is tricky in logalloc, so just use (void) instead.
+  int unused = write(aFd, buf, b - buf);
+  (void) unused;
 #endif
   va_end(ap);
 }