tools/nolibc: handle 64-bit off_t for llseek

Correctly handle 64-bit off_t values in preparation for 64-bit off_t on
32-bit architectures.

Signed-off-by: Thomas Weißschuh <[e-mail]>
Acked-by: Arnd Bergmann <[e-mail]>
Acked-by: Willy Tarreau <[e-mail]>

tools/include/nolibc/sys.h

···
 	off_t result;
 	int ret;
 
-	/* Only exists on 32bit where nolibc off_t is also 32bit */
-	ret = my_syscall5(__NR_llseek, fd, 0, offset, &loff, whence);
+	ret = my_syscall5(__NR_llseek, fd, offset >> 32, (uint32_t)offset, &loff, whence);
 	if (ret < 0)
 		result = ret;
 	else if (loff != (off_t)loff)