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trap: fp invalid checks in note handling

--- a/trap.c

+++ b/trap.c

@@ -205,6 +205,12 @@

 		procctl();

 	if(up->nnote == 0)

 		return 0;

+	

+	if(up->fpstate == FPactive) {

+		fpsave(up->fpsave);

+		up->fpstate = FPinactive;

+	}

+	up->fpstate |= FPillegal;

 	s = spllo();

 	qlock(&up->debug);

@@ -260,6 +266,7 @@

 	}

 	up->notified = 0;

+	up->fpstate &= ~FPillegal;

 	nureg = up->ureg;

 	oureg = (ulong) nureg;

 	if(!okaddr(oureg - BY2WD, BY2WD + sizeof(Ureg), 0) || (oureg & 3) != 0) {