qstr: constify dentry_init_security

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/security/security.c b/security/security.c
index 7095693..d441f45 100644
--- a/security/security.c
+++ b/security/security.c
@@ -356,7 +356,7 @@
 }
 
 int security_dentry_init_security(struct dentry *dentry, int mode,
-					struct qstr *name, void **ctx,
+					const struct qstr *name, void **ctx,
 					u32 *ctxlen)
 {
 	return call_int_hook(dentry_init_security, -EOPNOTSUPP, dentry, mode,