From: Nathan Muggli <nmuggli@google.com>

outputPtr2 is only used/initialized if hifipe is true.

Corresponding change in ChromeOS: https://crrev.com/c/4305518

--- a/prnt/hpcups/Halftoner.cpp
+++ b/prnt/hpcups/Halftoner.cpp
@@ -696,7 +696,10 @@
         rasterByte2 = 0;
         inputPtr  += ( numLoop-1 );
         outputPtr1 += ( numLoop/8 - 1 );
-        outputPtr2 += ( numLoop/8 - 1 );
+        if (hifipe)
+        {
+            outputPtr2 += ( numLoop/8 - 1 );
+        }
         diffusionErrorPtr += ( numLoop-1 );
 
         tmpShortStore = *diffusionErrorPtr;