xattr: add missing consts to function arguments

Add missing consts to xattr function arguments.

Signed-off-by: David Howells <dhowells@redhat.com>
Cc: Andreas Gruenbacher <agruen@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index 2daaddb..25cac5a 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -708,7 +708,7 @@
 
 }
 
-static int security_context_to_sid_core(char *scontext, u32 scontext_len,
+static int security_context_to_sid_core(const char *scontext, u32 scontext_len,
 					u32 *sid, u32 def_sid, gfp_t gfp_flags)
 {
 	char *scontext2;
@@ -835,7 +835,7 @@
  * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient
  * memory is available, or 0 on success.
  */
-int security_context_to_sid(char *scontext, u32 scontext_len, u32 *sid)
+int security_context_to_sid(const char *scontext, u32 scontext_len, u32 *sid)
 {
 	return security_context_to_sid_core(scontext, scontext_len,
 					    sid, SECSID_NULL, GFP_KERNEL);