fix some a/an typos

Signed-off-by: Lou Logan <lou@lrcd.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/libavfilter/graphparser.c b/libavfilter/graphparser.c
index d9f40d698d..8d15b5dfe0 100644
--- a/libavfilter/graphparser.c
+++ b/libavfilter/graphparser.c
@@ -354,7 +354,7 @@ static int parse_outputs(const char **buf, AVFilterInOut **curr_inputs,
             av_freep(&match);
             av_freep(&input);
         } else {
-            /* Not in the list, so add the first input as a open_output */
+            /* Not in the list, so add the first input as an open_output */
             input->name = name;
             insert_inout(open_outputs, input);
         }