bloblist: add api to get blob with size

bloblist_find function only returns the pointer of blob data,
which is fine for those self-describing data like FDT.
But as a common scenario, an interface is needed to retrieve both
the pointer and the size of the blob data.

Add a few ut test cases for the new api.

Signed-off-by: Raymond Mao <raymond.mao@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
diff --git a/test/common/bloblist.c b/test/common/bloblist.c
index 9467abf..ab8f41c 100644
--- a/test/common/bloblist.c
+++ b/test/common/bloblist.c
@@ -98,10 +98,12 @@
 	struct bloblist_hdr *hdr;
 	struct bloblist_rec *rec, *rec2;
 	char *data;
+	int size = 0;
 
 	/* At the start there should be no records */
 	hdr = clear_bloblist();
 	ut_assertnull(bloblist_find(TEST_TAG, TEST_BLOBLIST_SIZE));
+	ut_assertnull(bloblist_get_blob(TEST_TAG, &size));
 	ut_assertok(bloblist_new(TEST_ADDR, TEST_BLOBLIST_SIZE, 0, 0));
 	ut_asserteq(sizeof(struct bloblist_hdr), bloblist_get_size());
 	ut_asserteq(TEST_BLOBLIST_SIZE, bloblist_get_total_size());
@@ -114,6 +116,8 @@
 	ut_asserteq_addr(rec + 1, data);
 	data = bloblist_find(TEST_TAG, TEST_SIZE);
 	ut_asserteq_addr(rec + 1, data);
+	ut_asserteq_addr(bloblist_get_blob(TEST_TAG, &size), data);
+	ut_asserteq(size, TEST_SIZE);
 
 	/* Check the data is zeroed */
 	ut_assertok(check_zero(data, TEST_SIZE));