mem: Lower messages severity for inability to reset dirty tracker

The _actual_ need for this is checked in other place.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

kerndat.c

@@ -104,7 +104,7 @@ int kerndat_get_dirty_track(void)
 		pr_info("Dirty track supported on kernel\n");
 		kerndat_has_dirty_track = true;
 	} else
-		pr_err("Dirty tracking support is OFF\n");
+		pr_info("Dirty tracking support is OFF\n");
 
 	return 0;
 }

mem.c

@@ -64,7 +64,7 @@ int do_task_reset_dirty_track(int pid)
 	close(fd);
 
 	if (ret < 0) {
-		pr_perror("Can't reset %d's dirty memory tracker", pid);
+		pr_warn("Can't reset %d's dirty memory tracker (%d)", pid, errno);
 		return -1;
 	}