netfilter: xtables: consolidate code into xt_request_find_match

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>

net/netfilter/x_tables.c

diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
index bf2806a..ee7fe21 100644
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -214,6 +214,17 @@
 }
 EXPORT_SYMBOL(xt_find_match);
 
+struct xt_match *
+xt_request_find_match(uint8_t nfproto, const char *name, uint8_t revision)
+{
+	struct xt_match *match;
+
+	match = try_then_request_module(xt_find_match(nfproto, name, revision),
+					"%st_%s", xt_prefix[nfproto], name);
+	return (match != NULL) ? match : ERR_PTR(-ENOENT);
+}
+EXPORT_SYMBOL_GPL(xt_request_find_match);
+
 /* Find target, grabs ref.  Returns ERR_PTR() on error. */
 struct xt_target *xt_find_target(u8 af, const char *name, u8 revision)
 {