ELF: Use EI_NIDENT instead of numeric value

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/elf.h b/include/linux/elf.h
index bad1b16..ff9fbed 100644
--- a/include/linux/elf.h
+++ b/include/linux/elf.h
@@ -208,7 +208,7 @@
 } Elf32_Ehdr;
 
 typedef struct elf64_hdr {
-  unsigned char	e_ident[16];		/* ELF "magic number" */
+  unsigned char	e_ident[EI_NIDENT];	/* ELF "magic number" */
   Elf64_Half e_type;
   Elf64_Half e_machine;
   Elf64_Word e_version;