Fix unused parameter warning for mips builds am: 06d314917f am: dc432aa3c7
am: bca6f13b4a

Change-Id: I1b5d6ba071724b57459f93e974af783df0ca6dca
diff --git a/libbacktrace/BacktraceOffline.cpp b/libbacktrace/BacktraceOffline.cpp
index 9e95563..5e54328 100644
--- a/libbacktrace/BacktraceOffline.cpp
+++ b/libbacktrace/BacktraceOffline.cpp
@@ -34,6 +34,7 @@
 #include <vector>
 
 #include <android-base/file.h>
+#include <android-base/macros.h>
 #include <backtrace/Backtrace.h>
 #include <backtrace/BacktraceMap.h>
 #include <ziparchive/zip_archive.h>
@@ -534,6 +535,10 @@
     default:
       result = false;
   }
+#else
+  UNUSED(reg);
+  UNUSED(value);
+  result = false;
 #endif
   return result;
 }