[S390] preempt_count initialization.

The preempt_count in the thread_info structure must be initialized to 1.
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

include/asm-s390/thread_info.h

@@ -63,6 +63,7 @@ struct thread_info {
 	.exec_domain	= &default_exec_domain,	\
 	.flags		= 0,			\
 	.cpu		= 0,			\
+	.preempt_count	= 1,			\
 	.restart_block	= {			\
 		.fn = do_no_restart_syscall,	\
 	},					\