qstr: constify dentry_init_security

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index a86d537..22b6628 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2809,7 +2809,7 @@
 }
 
 static int selinux_dentry_init_security(struct dentry *dentry, int mode,
-					struct qstr *name, void **ctx,
+					const struct qstr *name, void **ctx,
 					u32 *ctxlen)
 {
 	u32 newsid;