ELF: Use EI_NIDENT instead of numeric value

Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

include/linux/elf.h

@@ -208,7 +208,7 @@ typedef struct elf32_hdr{
 } 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;