s390/traps: Get rid of superfluous cpu_has_vx() check

If the vector facility is installed cpu_has_vx() is always true, if it is
not installed the result is always false, and no vector exception can
happen. Therefore remove the superfluous check.

Reviewed-by: Sven Schnelle <[e-mail]>
Signed-off-by: Heiko Carstens <[e-mail]>
Signed-off-by: Vasily Gorbik <[e-mail]>

arch/s390/kernel/traps.c

···
 {
 	int si_code, vic;
 
-	if (!cpu_has_vx()) {
-		do_trap(regs, SIGILL, ILL_ILLOPN, "illegal operation");
-		return;
-	}
-
 	/* get vector interrupt code from fpc */
 	save_user_fpu_regs();
 	vic = (current->thread.ufpu.fpc & 0xf00) >> 8;