gcc: zero-sized array to fexlible array C99

Switch remaining zero sized struct to flexible arrays to be C99
complient.

These simple rules should apply:

- The incomplete array type must be the last element within the structure.
- There cannot be an array of structures that contain a flexible array member.
- Structures that contain a flexible array member cannot be used as a member of another structure.
- The structure must contain at least one named member in addition to the flexible array member.

Although some of the code pieces should be still improved.

1 files changed, 1 insertions, 1 deletions

diff --git a/libdm/datastruct/hash.c b/libdm/datastruct/hash.c
index 4c940039a..726347ea2 100644
--- a/libdm/datastruct/hash.c
+++ b/libdm/datastruct/hash.c
@@ -20,7 +20,7 @@ struct dm_hash_node {
 	void *data;
 	unsigned data_len;
 	unsigned keylen;
-	char key[0];
+	char key[];
 };
 
 struct dm_hash_table {