[patch -mm] Make check_signature() depend on CONFIG_HAS_IOMEM

[Heiko Carstens]

From: Heiko Carstens <heiko.carstens@xxxxxxxxxx>

check_signature() uses readb() and therefore should only be build on
CONFIG_HAS_IOMEM.

Otherwise breaks s390:
lib/check_signature.c: In function `check_signature':
lib/check_signature.c:19: error: implicit declaration of function `readb'

Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Signed-off-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
---
 lib/Makefile |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

Index: linux-2.6.22-rc6-mm1/lib/Makefile
===================================================================
--- linux-2.6.22-rc6-mm1.orig/lib/Makefile
+++ linux-2.6.22-rc6-mm1/lib/Makefile
@@ -5,8 +5,7 @@
 lib-y := ctype.o string.o vsprintf.o cmdline.o \
 	 rbtree.o radix-tree.o dump_stack.o \
 	 idr.o int_sqrt.o bitmap.o extable.o prio_tree.o \
-	 sha1.o irq_regs.o reciprocal_div.o argv_split.o \
-	 check_signature.o
+	 sha1.o irq_regs.o reciprocal_div.o argv_split.o
 
 lib-$(CONFIG_MMU) += ioremap.o pagewalk.o
 lib-$(CONFIG_SMP) += cpumask.o
@@ -22,7 +21,7 @@ CFLAGS_kobject_uevent.o += -DDEBUG
 endif
 
 obj-$(CONFIG_GENERIC_IOMAP) += iomap.o
-obj-$(CONFIG_HAS_IOMEM) += iomap_copy.o devres.o
+obj-$(CONFIG_HAS_IOMEM) += iomap_copy.o devres.o check_signature.o
 obj-$(CONFIG_DEBUG_LOCKING_API_SELFTESTS) += locking-selftest.o
 obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock_debug.o
 lib-$(CONFIG_RWSEM_GENERIC_SPINLOCK) += rwsem-spinlock.o
-
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