[S390] qdio: prevent compile warning under CONFIG_32BIT

Prevent the following compiler warning if compiling a 31 bit kernel:

drivers/s390/cio/qdio_main.c: In function ‘get_outbound_buffer_frontier’:
drivers/s390/cio/qdio_main.c:646:16: warning: ‘state’ may be used uninitialized in this function
  CC      lib/radix-tree.o
  CC      drivers/s390/scsi/zfcp_cfdc.o
drivers/s390/cio/qdio_main.c: In function ‘qdio_inbound_q_moved’:
drivers/s390/cio/qdio_main.c:479:16: warning: ‘state’ may be used uninitialized in this function
drivers/s390/cio/qdio_main.c:479:16: note: ‘state’ was declared here
Signed-off-by: NJan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/cio/qdio_main.c

@@ -476,7 +476,7 @@ static inline void inbound_primed(struct qdio_q *q, int count)
 static int get_inbound_buffer_frontier(struct qdio_q *q)
 {
 	int count, stop;
-	unsigned char state;
+	unsigned char state = 0;
 
 	/*
 	 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
@@ -643,7 +643,7 @@ void qdio_inbound_processing(unsigned long data)
 static int get_outbound_buffer_frontier(struct qdio_q *q)
 {
 	int count, stop;
-	unsigned char state;
+	unsigned char state = 0;
 
 	if (need_siga_sync(q))
 		if (((queue_type(q) != QDIO_IQDIO_QFMT) &&