tools/nolibc/stdlib: Support overflow checking for older compiler versions

Previously, we used __builtin_mul_overflow() to check for overflow in
the multiplication operation in the calloc() function. However, older
compiler versions don't support this built-in. This patch changes the
overflow checking mechanism to make it work on any compiler version
by using a division method to check for overflow. No functional change
intended. While in there, remove the unused variable `void *orig`.

Link: https://lore.kernel.org/lkml/[email protected]
Suggested-by: Willy Tarreau <[email protected]>
Cc: Alviro Iskandar Setiawan <[email protected]>
Signed-off-by: Ammar Faizi <[email protected]>
Acked-by: Willy Tarreau <[email protected]>
Reviewed-by: Alviro Iskandar Setiawan <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>

0 files changed, 0 insertions, 0 deletions