arch/um: remove duplicate includes

Signed-off-by: NLucas Woods <woodzy@gmail.com>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

arch/um/os-Linux/sigio.c

@@ -20,7 +20,6 @@
 #include "sigio.h"
 #include "os.h"
 #include "um_malloc.h"
-#include "init.h"
 
 /* Protected by sigio_lock(), also used by sigio_cleanup, which is an
  * exitcall.