simplify

src/vmod_blobdigest.c

@@ -260,22 +260,20 @@ ws_alloc_digest(VRT_CTX, const size_t digestsz, void **digestp,
 		const char * const restrict context,
 		const char * const restrict caller)
 {
+	unsigned char *spc;
 	struct vrt_blob *b;
-	uintptr_t snap;
 
 	CHECK_OBJ_NOTNULL(ctx->ws, WS_MAGIC);
 	AN(digestp);
-	snap = WS_Snapshot(ctx->ws);
-	if ((b = WS_Alloc(ctx->ws, sizeof *b)) == NULL) {
-		VERRNOMEM(ctx, "allocating blob in %s.%s()", context, caller);
-		return (NULL);
-	}
-	if ((b->blob = *digestp = WS_Alloc(ctx->ws, digestsz)) == NULL) {
-		WS_Reset(ctx->ws, snap);
-		VERRNOMEM(ctx, "allocating hash result in %s.%s()", context,
-		    caller);
+
+	spc = WS_Alloc(ctx->ws, PRNDUP(digestsz) + sizeof *b);
+	if (spc == NULL) {
+		VERRNOMEM(ctx, "WS_Alloc in %s.%s()", context, caller);
 		return (NULL);
 	}
+
+	b = (void *)(spc + PRNDUP(digestsz));
+	b->blob = *digestp = spc;
 	b->type = BLOB_BLOBDIGEST_DIGEST_TYPE;
 	b->len = digestsz;