Added missing printf format type.

%z was actually just a modifier.
Review URL: https://codereview.appspot.com/5569082

git-svn-id: https://angleproject.googlecode.com/svn/trunk@979 736b8ea6-26fd-11df-bfd4-992fa37f6226
diff --git a/src/compiler/PoolAlloc.cpp b/src/compiler/PoolAlloc.cpp
index d5c3599..a600c02 100644
--- a/src/compiler/PoolAlloc.cpp
+++ b/src/compiler/PoolAlloc.cpp
@@ -161,7 +161,7 @@
             sprintf(assertMsg, "PoolAlloc: Damage %s %Iu byte allocation at 0x%p\n",
                     locText, size, data());
 #else
-            sprintf(assertMsg, "PoolAlloc: Damage %s %z byte allocation at 0x%p\n",
+            sprintf(assertMsg, "PoolAlloc: Damage %s %zu byte allocation at 0x%p\n",
                     locText, size, data());
 #endif
             assert(0 && "PoolAlloc: Damage in guard block");