Turning on warning as error on Linux

src/pdf/SkPDFCatalog.cpp

Index: src/pdf/SkPDFCatalog.cpp
===================================================================
--- src/pdf/SkPDFCatalog.cpp	(revision 8038)
+++ src/pdf/SkPDFCatalog.cpp	(working copy)
@@ -128,8 +128,11 @@
         first++;
     }
     for (int i = first; i <= last; i++) {
+        // For 32 bits platforms, the maximum offset has to fit within off_t which is a 32 bits
+        // signed integer on these platforms. On other platforms, we can use the actual maximum.
+        SkDEBUGCODE(static const off_t kMaxOff = (sizeof(off_t) > 4) ? 10000000000 : 2147483647;)
         SkASSERT(fCatalog[i].fFileOffset > 0);
-        SkASSERT(fCatalog[i].fFileOffset <= 9999999999LL);
+        SkASSERT(fCatalog[i].fFileOffset < kMaxOff);
         stream->writeBigDecAsText(fCatalog[i].fFileOffset, 10);
         stream->writeText(" 00000 n \n");
     }