[S390] nss: Free unused memory in kernel image.

With CONFIG_SHARED_KERNEL the kernel text segment that might be in a
read only memory sections starts at 1MB. Memory between 0x12000 and
0x100000 is unused then. Free this, so we have appr. an extra MB
of memory available.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/cio/cio.c

@@ -1048,7 +1048,7 @@ void reipl_ccw_dev(struct ccw_dev_id *devid)
 	do_reipl_asm(*((__u32*)&schid));
 }
 
-extern struct schib ipl_schib;
+static struct schib __initdata ipl_schib;
 
 /*
  * ipl_save_parameters gets called very early. It is not allowed to access