include cleanup using iwyu

src/output/FifoOutputPlugin.cxx

@@ -22,7 +22,6 @@
 #include "ConfigError.hxx"
 #include "OutputAPI.hxx"
 #include "Timer.hxx"
-#include "system/fd_util.h"
 #include "fs/AllocatedPath.hxx"
 #include "fs/FileSystem.hxx"
 #include "util/Error.hxx"
@@ -30,10 +29,8 @@
 #include "Log.hxx"
 #include "open.h"
 
-#include <sys/types.h>
 #include <sys/stat.h>
 #include <errno.h>
-#include <string.h>
 #include <unistd.h>
 
 #define FIFO_BUFFER_SIZE 65536 /* pipe capacity on Linux >= 2.6.11 */

src/output/JackOutputPlugin.cxx

@@ -34,10 +34,6 @@
 
 #include <stdlib.h>
 #include <string.h>
-#include <stdio.h>
-#include <sys/types.h>
-#include <unistd.h>
-#include <errno.h>
 
 enum {
 	MAX_PORTS = 16,

src/output/NullOutputPlugin.cxx

@@ -22,8 +22,6 @@
 #include "OutputAPI.hxx"
 #include "Timer.hxx"
 
-#include <assert.h>
-
 struct NullOutput {
 	struct audio_output base;
 

src/output/PulseOutputPlugin.hxx

@@ -41,6 +41,6 @@ pulse_output_clear_mixer(PulseOutput *po, PulseMixer *pm);
 
 bool
 pulse_output_set_volume(PulseOutput *po,
-			const struct pa_cvolume *volume, Error &error);
+			const pa_cvolume *volume, Error &error);
 
 #endif