[NaCl SDK] nacl_io: Fix bug in Path::Range introduced in recent change.

native_client_sdk/src/tests/nacl_io_test/path_test.cc

Index: native_client_sdk/src/tests/nacl_io_test/path_test.cc
diff --git a/native_client_sdk/src/tests/nacl_io_test/path_test.cc b/native_client_sdk/src/tests/nacl_io_test/path_test.cc
index b7b82cc636185fa6c041c032cb38f524a050ecab..77160676202549f251036e48edfb78f851d63f8f 100644
--- a/native_client_sdk/src/tests/nacl_io_test/path_test.cc
+++ b/native_client_sdk/src/tests/nacl_io_test/path_test.cc
@@ -70,6 +70,7 @@ TEST(PathTest, OnePart_Absolute) {
   EXPECT_EQ("/", p.Range(0, 1));
   EXPECT_EQ("foo", p.Range(1, 2));
   EXPECT_EQ("/foo", p.Range(0, 2));
+  EXPECT_EQ("", p.Range(2, 2));
   EXPECT_EQ("/", p.Parent().Join());
 }
 
@@ -85,6 +86,7 @@ TEST(PathTest, TwoPart_Relative) {
   EXPECT_EQ("foo", p.Range(0, 1));
   EXPECT_EQ("bar", p.Range(1, 2));
   EXPECT_EQ("foo/bar", p.Range(0, 2));
+  EXPECT_EQ("", p.Range(2, 2));
   EXPECT_EQ("foo", p.Parent().Join());
 }
 
@@ -185,6 +187,9 @@ TEST(PathTest, Range_Relative) {
   EXPECT_EQ("relative/path", p.Range(1, 3));
 
   EXPECT_EQ("path", p.Range(2, 3));
+
+  EXPECT_EQ("", p.Range(2, 100));
+  EXPECT_EQ("", p.Range(42, 67));
 }
 
 TEST(PathTest, Range_Absolute) {
@@ -203,6 +208,9 @@ TEST(PathTest, Range_Absolute) {
   EXPECT_EQ("absolute/path", p.Range(2, 4));
 
   EXPECT_EQ("path", p.Range(3, 4));
+
+  EXPECT_EQ("", p.Range(2, 100));
+  EXPECT_EQ("", p.Range(42, 67));
 }
 
 TEST(PathTest, Assign) {