filter: return on null filter from open and close

So that we don't have to include the if(filter) open_filter(filter)
block everywhere, we introduce the guard in the function itself. This
should simplify quite a bit of code.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/filter.c b/filter.c
index 3702585..7983737 100644
--- a/filter.c
+++ b/filter.c
@@ -351,6 +351,8 @@ int cgit_open_filter(struct cgit_filter *filter, ...)
 {
         int result;
         va_list ap;
+        if (!filter)
+                return 0;
         va_start(ap, filter);
         result = filter->open(filter, ap);
         va_end(ap);
@@ -359,6 +361,8 @@ int cgit_open_filter(struct cgit_filter *filter, ...)
 
 int cgit_close_filter(struct cgit_filter *filter)
 {
+        if (!filter)
+                return 0;
         return filter->close(filter);
 }