liblzma: Silence more uint32_t vs. size_t warnings.

src/liblzma/lz/lz_encoder.c

diff --git a/src/liblzma/lz/lz_encoder.c b/src/liblzma/lz/lz_encoder.c
index 01dfc06..48bc487 100644
--- a/src/liblzma/lz/lz_encoder.c
+++ b/src/liblzma/lz/lz_encoder.c
@@ -139,7 +139,7 @@
 			&& coder->mf.read_pos < coder->mf.read_limit) {
 		// Match finder may update coder->pending and expects it to
 		// start from zero, so use a temporary variable.
-		const size_t pending = coder->mf.pending;
+		const uint32_t pending = coder->mf.pending;
 		coder->mf.pending = 0;
 
 		// Rewind read_pos so that the match finder can hash

src/liblzma/lzma/lzma_encoder.c

diff --git a/src/liblzma/lzma/lzma_encoder.c b/src/liblzma/lzma/lzma_encoder.c
index 31cb4f0..4c5f99c 100644
--- a/src/liblzma/lzma/lzma_encoder.c
+++ b/src/liblzma/lzma/lzma_encoder.c
@@ -464,7 +464,7 @@
 	bittree_reset(lencoder->high, LEN_HIGH_BITS);
 
 	if (!fast_mode)
-		for (size_t pos_state = 0; pos_state < num_pos_states;
+		for (uint32_t pos_state = 0; pos_state < num_pos_states;
 				++pos_state)
 			length_update_prices(lencoder, pos_state);