fix the testTruncateEacces cast in release

Change-Id: If6f0c7b09b9fe0a9f8d1009ba426ce642bca2626

kernel_lite/fs_posix/src/FsUnistdTest.cpp

@@ -350,7 +350,7 @@ HWTEST_F(FileSystemTest, testTruncateEacces, Function | MediumTest | Level3)
 {
     EXPECT_EQ(truncate("/", 10), -1);
     printf("errno = %d\n", errno);
-    EXPECT_EQ(errno, EISDIR);
+    EXPECT_EQ(errno, EACCES);
 }
 #endif