bcachefs: Fix compiler warnings

Type size_t is architecture-specific. Fix warnings for some non-amd64
arches.
Signed-off-by: Brett Holman <bholman.devel@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/journal_reclaim.c

@@ -653,7 +653,7 @@ static int __bch2_journal_reclaim(struct journal *j, bool direct)
 				atomic_long_read(&c->btree_key_cache.nr_dirty),
 				atomic_long_read(&c->btree_key_cache.nr_keys));
 
-		min_key_cache = min(bch2_nr_btree_keys_need_flush(c), 128UL);
+		min_key_cache = min(bch2_nr_btree_keys_need_flush(c), (size_t) 128);
 
 		nr_flushed = journal_flush_pins(j, seq_to_flush,
 						min_nr, min_key_cache);

fs/bcachefs/subvolume.h

@@ -75,7 +75,7 @@ static inline void snapshots_seen_init(struct snapshots_seen *s)
 static inline int snapshots_seen_add(struct bch_fs *c, struct snapshots_seen *s, u32 id)
 {
 	if (s->nr == s->size) {
-		size_t new_size = max(s->size, 128UL) * 2;
+		size_t new_size = max(s->size, (size_t) 128) * 2;
 		u32 *d = krealloc(s->d, new_size * sizeof(s->d[0]), GFP_KERNEL);
 
 		if (!d) {