Drop mlockall()

now that we have
 - shrinkers running in the background via a thread
 - run_shrinkers() considering swap usage

this can probably be safely dropped - and it causes problems when
running as non root, so let's do so.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

bcachefs.c

@@ -187,8 +187,6 @@ static int subvolume_cmds(int argc, char *argv[])
 
 int main(int argc, char *argv[])
 {
-	/* we don't want to swap */
-	mlockall(MCL_FUTURE);
 	raid_init();
 
 	full_cmd = argv[0];