rslib: kill bogus dependency on list.h

list_head is defined in types.h, not list.h - this kills a sched.h
dependency.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

include/linux/rslib.h

@@ -10,7 +10,6 @@
 #ifndef _RSLIB_H_
 #define _RSLIB_H_
 
-#include <linux/list.h>
 #include <linux/types.h>	/* for gfp_t */
 #include <linux/gfp.h>		/* for GFP_KERNEL */