compat: Add missing inline keyword
The missing inline keyword before the definition of the
rpl_nf_ct_tmpl_free() function causes spurious warnings about the
function not being used on some older kernels.  Add the keyword
to suppress the warning.
@@ -33,7 +33,7 @@ out_free:
}
#define nf_ct_tmpl_alloc rpl_nf_ct_tmpl_alloc
-static void rpl_nf_ct_tmpl_free(struct nf_conn *tmpl)
+static inline void rpl_nf_ct_tmpl_free(struct nf_conn *tmpl)
{
nf_ct_ext_destroy(tmpl);
nf_ct_ext_free(tmpl);
