Cleanup symbols that should be static

Run analysis on symbols not used outside of their current file,
turn them into statics.

Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/idletime.c b/idletime.c
index 9e69607..c0bc0bf 100644
--- a/idletime.c
+++ b/idletime.c
@@ -379,7 +379,7 @@
 	return p * 100.0;
 }
 
-void fio_idle_prof_cleanup(void)
+static void fio_idle_prof_cleanup(void)
 {
 	if (ipc.ipts) {
 		free(ipc.ipts);