commit-graph: stop using signed integers to count Bloom filters

When writing a new commit graph we have a couple of counters that
provide statistics around what kind of Bloom filters we have or have not
written. These counters naturally count from zero and are only ever
incremented, but they use a signed integer as type regardless.

Refactor those fields to be unsigned instead. Using an unsigned type
makes it explicit to the reader that they never have to worry about
negative values and thus makes the code easier to understand.

Signed-off-by: Patrick Steinhardt <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: pks-t

commit-graph.c

@@ -1171,11 +1171,11 @@ struct write_commit_graph_context {
 	size_t total_bloom_filter_data_size;
 	const struct bloom_filter_settings *bloom_settings;
 
-	int count_bloom_filter_computed;
-	int count_bloom_filter_not_computed;
-	int count_bloom_filter_trunc_empty;
-	int count_bloom_filter_trunc_large;
-	int count_bloom_filter_upgraded;
+	unsigned count_bloom_filter_computed;
+	unsigned count_bloom_filter_not_computed;
+	unsigned count_bloom_filter_trunc_empty;
+	unsigned count_bloom_filter_trunc_large;
+	unsigned count_bloom_filter_upgraded;
 };
 
 static int write_graph_chunk_fanout(struct hashfile *f,
@@ -1780,16 +1780,16 @@ void ensure_generations_valid(struct repository *r,
 
 static void trace2_bloom_filter_write_statistics(struct write_commit_graph_context *ctx)
 {
-	trace2_data_intmax("commit-graph", ctx->r, "filter-computed",
-			   ctx->count_bloom_filter_computed);
-	trace2_data_intmax("commit-graph", ctx->r, "filter-not-computed",
-			   ctx->count_bloom_filter_not_computed);
-	trace2_data_intmax("commit-graph", ctx->r, "filter-trunc-empty",
-			   ctx->count_bloom_filter_trunc_empty);
-	trace2_data_intmax("commit-graph", ctx->r, "filter-trunc-large",
-			   ctx->count_bloom_filter_trunc_large);
-	trace2_data_intmax("commit-graph", ctx->r, "filter-upgraded",
-			   ctx->count_bloom_filter_upgraded);
+	trace2_data_uintmax("commit-graph", ctx->r, "filter-computed",
+			    ctx->count_bloom_filter_computed);
+	trace2_data_uintmax("commit-graph", ctx->r, "filter-not-computed",
+			    ctx->count_bloom_filter_not_computed);
+	trace2_data_uintmax("commit-graph", ctx->r, "filter-trunc-empty",
+			    ctx->count_bloom_filter_trunc_empty);
+	trace2_data_uintmax("commit-graph", ctx->r, "filter-trunc-large",
+			    ctx->count_bloom_filter_trunc_large);
+	trace2_data_uintmax("commit-graph", ctx->r, "filter-upgraded",
+			    ctx->count_bloom_filter_upgraded);
 }
 
 static void compute_bloom_filters(struct write_commit_graph_context *ctx)