LibAudio: Use size_t in loops

This is more idiomatic :^)

Userland/Libraries/LibAudio/FlacLoader.cpp

@@ -740,17 +740,17 @@ Vector<i32> FlacLoaderPlugin::decode_residual(Vector<i32>& decoded, FlacSubframe
 {
     u8 residual_mode = bit_input.read_bits_big_endian(2);
     u8 partition_order = bit_input.read_bits_big_endian(4);
-    u32 partitions = 1 << partition_order;
+    size_t partitions = 1 << partition_order;
 
     if (residual_mode == FlacResidualMode::Rice4Bit) {
         // decode a single Rice partition with four bits for the order k
-        for (u32 i = 0; i < partitions; ++i) {
+        for (size_t i = 0; i < partitions; ++i) {
             auto rice_partition = decode_rice_partition(4, partitions, i, subframe, bit_input);
             decoded.extend(move(rice_partition));
         }
     } else if (residual_mode == FlacResidualMode::Rice5Bit) {
         // five bits equivalent
-        for (u32 i = 0; i < partitions; ++i) {
+        for (size_t i = 0; i < partitions; ++i) {
             auto rice_partition = decode_rice_partition(5, partitions, i, subframe, bit_input);
             decoded.extend(move(rice_partition));
         }
@@ -782,11 +782,11 @@ ALWAYS_INLINE Vector<i32> FlacLoaderPlugin::decode_rice_partition(u8 partition_t
     // escape code for unencoded binary partition
     if (k == (1 << partition_type) - 1) {
         u8 unencoded_bps = bit_input.read_bits_big_endian(5);
-        for (u32 r = 0; r < residual_sample_count; ++r) {
+        for (size_t r = 0; r < residual_sample_count; ++r) {
             rice_partition[r] = bit_input.read_bits_big_endian(unencoded_bps);
         }
     } else {
-        for (u32 r = 0; r < residual_sample_count; ++r) {
+        for (size_t r = 0; r < residual_sample_count; ++r) {
             rice_partition[r] = decode_unsigned_exp_golomb(k, bit_input);
         }
     }