[PATCH nft] expression: missing line in describe command with invalid expression

[Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>]

Before:

 duh@testbed:~# nft describe blah
 symbol expression, datatype invalid (invalid)duh@testbed:#

After:

 duh@testbed:~# nft describe blah
 symbol expression, datatype invalid (invalid)
 duh@testbed:#

Fixes: 48aca2de80a7 ("iptopt: fix crash with invalid field/type combo")
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
 src/expression.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/expression.c b/src/expression.c
index dde48b6aa002..cb2573fec457 100644
--- a/src/expression.c
+++ b/src/expression.c
@@ -140,8 +140,10 @@ void expr_describe(const struct expr *expr, struct output_ctx *octx)
 		nft_print(octx, "%s expression, datatype %s (%s)",
 			  expr_name(expr), dtype->name, dtype->desc);
 
-		if (dtype == &invalid_type)
+		if (dtype == &invalid_type) {
+			nft_print(octx, "\n");
 			return;
+		}
 	}
 
 	if (dtype->basetype != NULL) {
-- 
2.30.2