kexec,x86: Use macro CRASH_MAX_MEMMAP_NR for clarification

[Zhang Yanfei]

For the allocation, using CRASH_MAX_MEMMAP_NR instead of KEXEC_MAX_SEGMENTS + 1 
seems more understandable.

Signed-off-by: Zhang Yanfei <zhangyanfei at cn.fujitsu.com>
---
 kexec/arch/i386/crashdump-x86.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kexec/arch/i386/crashdump-x86.c b/kexec/arch/i386/crashdump-x86.c
index 245402c..e4b8be3 100644
--- a/kexec/arch/i386/crashdump-x86.c
+++ b/kexec/arch/i386/crashdump-x86.c
@@ -975,7 +975,7 @@ int load_crashdump_segments(struct kexec_info *info, char* mod_cmdline,
                return -1; 
 
        /* Memory regions which panic kernel can safely use to boot into */
-       sz = (sizeof(struct memory_range) * (KEXEC_MAX_SEGMENTS + 1));
+       sz = (sizeof(struct memory_range) * CRASH_MAX_MEMMAP_NR);
        memmap_p = xmalloc(sz);
        memset(memmap_p, 0, sz);
        add_memmap(memmap_p, info->backup_src_start, info->backup_src_size);
-- 
1.7.1