bcachefs: Fix bad shift in bch2_read_flag_list()

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

fs/bcachefs/util.c

@@ -222,7 +222,7 @@ u64 bch2_read_flag_list(const char *opt, const char * const list[])
 			break;
 		}
 
-		ret |= 1 << flag;
+		ret |= BIT_ULL(flag);
 	}
 
 	kfree(d);