s390: fix restore of invalid floating-point-control

The fixup of the inline assembly to restore the floating-point-control
register needs to check for instruction address *after* the lfcp
instruction as the specification and data exceptions are suppresssing.

Signed-off-by: Martin Schwidefsky <[e-mail]>

arch/s390/include/asm/switch_to.h

···
 		return 0;
 
 	asm volatile(
-		"0:	lfpc    %1\n"
-		"	la	%0,0\n"
+		"	lfpc    %1\n"
+		"0:	la	%0,0\n"
 		"1:\n"
 		EX_TABLE(0b,1b)
 		: "=d" (rc) : "Q" (*fpc), "0" (-EINVAL));