LibC: open() now just returns syscall(SYS_OPEN, ...)

errno is handled in syscall()

libc/fcntl.cpp

@@ -5,11 +5,5 @@
 
 int open(const char* path, int oflag, ...)
 {
-	int ret = syscall(SYS_OPEN, path, oflag);
-	if (ret < 0)
-	{
-		errno = -ret;
-		return -1;
-	}
-	return ret;
+	return syscall(SYS_OPEN, path, oflag);
 }