[fcformat] Add element filtering and deletion

The filtering, '%{+elt1,elt2,elt3{subexpr}}' will evaluate subexpr
with a pattern only having the listed elements from the surrounding
pattern.

The deletion, '%{-elt1,elt2,elt3{subexpr}}' will evaluate subexpr
with a the surrounding pattern sans the listed elements.

1 files changed, 5 insertions, 2 deletions

diff --git a/fc-query/fc-query.c b/fc-query/fc-query.c
index 8c5672c6..4d707bc1 100644
--- a/fc-query/fc-query.c
+++ b/fc-query/fc-query.c
@@ -162,8 +162,11 @@ main (int argc, char **argv)
 		    FcChar8 *s;
 
 		    s = FcPatternFormat (pat, format);
-		    printf ("%s", s);
-		    free (s);
+		    if (s)
+		    {
+			printf ("%s", s);
+			free (s);
+		    }
 		}
 		else
 		{