crypto/bio/bio_print.c: avoid integer overflow when reading width/precision

crypto/bio/bio_print.c: avoid integer overflow when reading width/precision

Both width and precision are "decimal digit strings" of unspecified size,
but we can realistically cap it at INT_MAX.

Signed-off-by: Eugene Syromiatnikov <esyr@openssl.org>
Reviewed-by: Saša Nedvědický <sashan@openssl.org>
Reviewed-by: Neil Horman <nhorman@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/28177)