bloblist: Fix use of uninitialized variable

Initialize addr to zero which allows to build on the CI
which is more strict.

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

common/bloblist.c

@@ -499,7 +499,7 @@ int bloblist_init(void)
 {
 	bool fixed = IS_ENABLED(CONFIG_BLOBLIST_FIXED);
 	int ret = -ENOENT;
-	ulong addr, size;
+	ulong addr = 0, size;
 	/*
 	 * If U-Boot is not in the first phase, an existing bloblist must be
 	 * at a fixed address.