cleanup: remove some unnecessary input.[ch] typedefs

Remove some unnecessary typedefs and remove pointless mp_ prefix from
some internal struct names.

Change the type of the "close_func" pointers from "void f(int fd)" to
"int f(int fd)" so that using standard close() there is valid.

Delete some useless assert() statements.

Move internal MP_MAX_KEY_DOWN define from input.h to input.c.

1 files changed, 1 insertions, 1 deletions

diff --git a/input/ar.c b/input/ar.c
index 2f3fe16b24..f8a3f0ad44 100644
--- a/input/ar.c
+++ b/input/ar.c
@@ -412,7 +412,7 @@ int mp_input_ar_read(void *ctx, int fd)
     return ret | down;
 }
 
-void mp_input_ar_close(int fd)
+int mp_input_ar_close(int fd)
 {
     if (initialized == 0)
         return;