whack-a-mole: there's no point doing set_fs(USER_DS) in sigframe setup

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --cc arch/frv/kernel/signal.c
Simple merge

diff --cc arch/m32r/kernel/signal.c
Simple merge

diff --cc arch/microblaze/kernel/signal.c
Simple merge

diff --cc arch/sh/kernel/signal_32.c
Simple merge

diff --cc arch/sh/kernel/signal_64.c
Simple merge

diff --cc arch/xtensa/kernel/signal.c
Simple merge