freevxfs: Replace one-element array with flexible array member

Replace the deprecated one-element array with a modern flexible array
member in the struct vxfs_dirblk.

Link: KSPP#79
Signed-off-by: Thorsten Blum <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Christoph Hellwig <[email protected]>
Signed-off-by: Christian Brauner <[email protected]>

fs/freevxfs/vxfs_dir.h

@@ -25,7 +25,7 @@
 struct vxfs_dirblk {
 	__fs16		d_free;		/* free space in dirblock */
 	__fs16		d_nhash;	/* no of hash chains */
-	__fs16		d_hash[1];	/* hash chain */
+	__fs16		d_hash[];	/* hash chain */
 };
 
 /*