When "a" and "b" are 32bit values, we don't have to cast
them to 128bit, 64bit is enough.

This patch is the result of coccinelle script
scripts/coccinelle/simplify_muldiv64.cocci
Signed-off-by: NLaurent Vivier <lvivier@redhat.com>
For xtensa PIC:
Acked-by: NMax Filippov <jcmvbkbc@gmail.com>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>