alpha: fix lazy-FPU mis(merged/applied/whatnot)

Looks like a braino that used to be fixed in e.g. #next.alpha
had gotten into alpha.git cherry-picked version of that patch.

Sure, alpha has no preempt, but preempt_enable() in place of
preempt_disable() is actively confusing the readers...

Other than that, the cherry-picked variant matches what I have.

Signed-off-by: Al Viro <[e-mail]>

arch/alpha/lib/fpreg.c

···
 
 	if (unlikely(reg >= 32))
 		return 0;
-	preempt_enable();
+	preempt_disable();
 	if (current_thread_info()->status & TS_SAVED_FP)
 		val = current_thread_info()->fp[reg];
 	else switch (reg) {
···
 	if (unlikely(reg >= 32))
 		return 0;
 
-	preempt_enable();
+	preempt_disable();
 	if (current_thread_info()->status & TS_SAVED_FP) {
 		LDT(0, current_thread_info()->fp[reg]);
 		STS(0, val);