Make out-of-context `fi' invocations not cause an error, but just a

warning.  From a TODO by schwarze@, originally noted by Brad Smith.

1 files changed, 1 insertions, 0 deletions

diff --git a/main.c b/main.c
index 87ba122b..9568e5da 100644
--- a/main.c
+++ b/main.c
@@ -158,6 +158,7 @@ static	const char * const	mandocerrs[MANDOCERR_MAX] = {
 	"list type must come first",
 	"tag lists require a width argument",
 	"missing font type",
+	"skipping end of block that is not open",
 
 	/* related to bad macro arguments */
 	"skipping argument",