[patch for-3.16] kexec: fix build error when hugetlbfs is disabled

[David Rientjes <rientjes@xxxxxxxxxx>]

free_huge_page() is undefined without CONFIG_HUGETLBFS and there's no need
to filter PageHuge() page is such a configuration either, so avoid exporting the
symbol to fix a build error:

   In file included from kernel/kexec.c:14:0:
   kernel/kexec.c: In function 'crash_save_vmcoreinfo_init':
   kernel/kexec.c:1623:20: error: 'free_huge_page' undeclared (first use in this function)
     VMCOREINFO_SYMBOL(free_huge_page);
                       ^

Reported-by: kbuild test robot <fengguang.wu@xxxxxxxxx>
Acked-by: Olof Johansson <olof@xxxxxxxxx>
Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
---
 kernel/kexec.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/kexec.c b/kernel/kexec.c
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -1620,7 +1620,9 @@ static int __init crash_save_vmcoreinfo_init(void)
 #endif
 	VMCOREINFO_NUMBER(PG_head_mask);
 	VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE);
+#ifdef CONFIG_HUGETLBFS
 	VMCOREINFO_SYMBOL(free_huge_page);
+#endif
 
 	arch_crash_save_vmcoreinfo();
 	update_vmcoreinfo_note();

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