Fix compiler error on com_android_mtp_AppFuse.cpp.

The CL adds explicit assigning for reply_size to prevent 'unused'
compiler error.

Change-Id: I307758debb23b5bf56ddf71d54813b8cd81d8f49
diff --git a/packages/MtpDocumentsProvider/jni/com_android_mtp_AppFuse.cpp b/packages/MtpDocumentsProvider/jni/com_android_mtp_AppFuse.cpp
index dbce609..9267f4c 100644
--- a/packages/MtpDocumentsProvider/jni/com_android_mtp_AppFuse.cpp
+++ b/packages/MtpDocumentsProvider/jni/com_android_mtp_AppFuse.cpp
@@ -119,6 +119,9 @@
         if (in->minor <= 22) {
             *reply_size = FUSE_COMPAT_22_INIT_OUT_SIZE;
         }
+#else
+        // Don't drop this line to prevent an 'unused' compile error.
+        *reply_size = sizeof(fuse_init_out);
 #endif
 
         out->major = FUSE_KERNEL_VERSION;