(split) Similar to the (1 << 31) case it is not defined to do (2 << 30).
(split) Fix undefined behavior: (1 << 31) is not defined as 1 is an int and this
shifts into the sign bit.  Instead use (1U << 31) which gets the
expected result.

This fix is not ideal as it assumes a 32 bit int, but does fix the issue
for most cases.

A similar change was made in OpenBSD.

Discussed with:	-arch, rdivacky
Reviewed by:	cperciva
(split) The RUN_MAX_TXSZ constat is defined as Tx desc + Tx wireless info + MCLBYTES +
max padding.  We were lucky in that run(4) working fine since both
rt2860_rxwi and rt2860_txwi structure sizes are the same.
(split) Merge branch 'CURRENT' (commit 'ba8b7c37')

Conflicts:
	sys/dev/usb/wlan/if_run.c