input/ar.c, input/lirc.c: fix changes missing from 1916b95b8

1916b95b8 changed two function types from returning "void" to
returning "int", but was missing changes to add "return 0;" to the
functions. Fix.

The reason for the change in the original commit was that the
functions were called through a function pointer returning int anyway,
so the missing return probably made things no more likely to fail at
runtime than they were before that commit. However, it caused a
compilation failure with clang, which treats non-void function not
returning a value as a fatal error (in GCC it's just a warning).

input/ar.c

@@ -415,7 +415,7 @@ int mp_input_ar_read(void *ctx, int fd)
 int mp_input_ar_close(int fd)
 {
     if (initialized == 0)
-        return;
+        return 0;
 
     // Close the device.
     (*hidDeviceInterface)->close(hidDeviceInterface);
@@ -431,6 +431,7 @@ int mp_input_ar_close(int fd)
     (*hidDeviceInterface)->Release(hidDeviceInterface);
 
     initialized = 0;
+    return 0;
 }
 
 #ifdef TEST

input/lirc.c

@@ -119,4 +119,5 @@ int mp_input_lirc_close(int fd)
   cmd_buf = NULL;
   lirc_freeconfig(lirc_config);
   lirc_deinit();
+  return 0;
 }