Fix an accidental PRId64 to PRIx64.

Change-Id: Ic5313289d826bac74c3466b33f1f167a8f0955ad
diff --git a/cryptfs.c b/cryptfs.c
index edde4ad..d11c133 100644
--- a/cryptfs.c
+++ b/cryptfs.c
@@ -1953,7 +1953,7 @@
         return 0;
     }
 
-    SLOGV("Copying %d blocks at offset %" PRId64, data->count, data->offset);
+    SLOGV("Copying %d blocks at offset %" PRIx64, data->count, data->offset);
 
     if (pread64(data->realfd, data->buffer,
                 info.block_size * data->count, data->offset)