Add a check for ioremap() failure in copy_oldmem_page().
This patch also includes small coding style fixes.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
---
 arch/x86/kernel/crash_dump_64.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Index: 2.6-git/arch/x86/kernel/crash_dump_64.c
===================================================================
--- 2.6-git.orig/arch/x86/kernel/crash_dump_64.c
+++ 2.6-git/arch/x86/kernel/crash_dump_64.c
@@ -33,14 +33,16 @@ ssize_t copy_oldmem_page(unsigned long p
 		return 0;
 
 	vaddr = ioremap(pfn << PAGE_SHIFT, PAGE_SIZE);
+	if (!vaddr)
+		return -ENOMEM;
 
 	if (userbuf) {
-		if (copy_to_user(buf, (vaddr + offset), csize)) {
+		if (copy_to_user(buf, vaddr + offset, csize)) {
 			iounmap(vaddr);
 			return -EFAULT;
 		}
 	} else
-	memcpy(buf, (vaddr + offset), csize);
+		memcpy(buf, vaddr + offset, csize);
 
 	iounmap(vaddr);
 	return csize;
--
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