[NaCk SDK] nacl_io: Don't assume ~S_IFMT are the mode bits.

native_client_sdk/src/libraries/nacl_io/node.cc

Index: native_client_sdk/src/libraries/nacl_io/node.cc
diff --git a/native_client_sdk/src/libraries/nacl_io/node.cc b/native_client_sdk/src/libraries/nacl_io/node.cc
index b91726fb1199bbaee73fe10f7b61904a4a755f2b..ddf90d1deb525e8a43386bdb6734c76ce8e53a71 100644
--- a/native_client_sdk/src/libraries/nacl_io/node.cc
+++ b/native_client_sdk/src/libraries/nacl_io/node.cc
@@ -189,7 +189,7 @@ int Node::GetLinks() {
 }
 
 int Node::GetMode() {
-  return stat_.st_mode & ~S_IFMT;
+  return stat_.st_mode & S_MODEBITS;
 }
 
 Error Node::GetSize(off_t* out_size) {
@@ -208,8 +208,8 @@ void Node::SetType(int type) {
 }
 
 void Node::SetMode(int mode) {
-  assert((mode & S_IFMT) == 0);
-  stat_.st_mode &= S_IFMT;
+  assert((mode & ~S_MODEBITS) == 0);
+  stat_.st_mode &= ~S_MODEBITS;
   stat_.st_mode |= mode;
 }