des-compat.c: Change length argument type from uint32_t to size_t.

(cherry picked from commit f3bbc422)

ChangeLog

+2018-08-09  Niels Möller  <nisse@lysator.liu.se>
+
+	Backported from master branch.
+	* des-compat.c (des_compat_des3_encrypt)
+	(des_compat_des3_decrypt): Change length argument type to size_t.
+
 2017-11-19  Niels Möller  <nisse@lysator.liu.se>
 
 	* Released nettle-3.4.

des-compat.c

@@ -48,7 +48,7 @@ struct des_compat_des3 { const struct des_ctx *keys[3]; };
 
 static void
 des_compat_des3_encrypt(struct des_compat_des3 *ctx,
-			uint32_t length, uint8_t *dst, const uint8_t *src)
+			size_t length, uint8_t *dst, const uint8_t *src)
 {
   nettle_des_encrypt(ctx->keys[0], length, dst, src);
   nettle_des_decrypt(ctx->keys[1], length, dst, dst);
@@ -57,7 +57,7 @@ des_compat_des3_encrypt(struct des_compat_des3 *ctx,
 
 static void
 des_compat_des3_decrypt(struct des_compat_des3 *ctx,
-			uint32_t length, uint8_t *dst, const uint8_t *src)
+			size_t length, uint8_t *dst, const uint8_t *src)
 {
   nettle_des_decrypt(ctx->keys[2], length, dst, src);
   nettle_des_encrypt(ctx->keys[1], length, dst, dst);