[glib: 2/5] Fix warnings

[Sebastian Dröge <sdroege src gnome org>]

commit 1b6fa560b0e64b37108544b7aa493e6698e609b5
Author: Frederic Martinsons <frederic martinsons sigfox com>
Date:   Sat Jan 2 18:45:01 2021 +0100

    Fix warnings
    
    Related: glib#1735
    
    Signed-off-by: Frederic Martinsons <frederic martinsons sigfox com>

 gvdb-builder.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)
---
diff --git a/gvdb-builder.c b/gvdb-builder.c
index b8ecbe3d7..918ee43fd 100644
--- a/gvdb-builder.c
+++ b/gvdb-builder.c
@@ -206,7 +206,7 @@ item_to_index (GvdbItem *item)
   if (item != NULL)
     return item->assigned_index;
 
-  return guint32_to_le (-1u);
+  return guint32_to_le ((guint32) -1);
 }
 
 typedef struct
@@ -234,7 +234,7 @@ file_builder_allocate (FileBuilder         *fb,
   if (size == 0)
     return NULL;
 
-  fb->offset += (-fb->offset) & (alignment - 1);
+  fb->offset += (guint64) (-fb->offset) & (alignment - 1);
   chunk = g_slice_new (FileChunk);
   chunk->offset = fb->offset;
   chunk->size = size;
@@ -463,9 +463,11 @@ static GString *
 file_builder_serialise (FileBuilder          *fb,
                         struct gvdb_pointer   root)
 {
-  struct gvdb_header header = { { 0, }, };
+  struct gvdb_header header;
   GString *result;
 
+  memset (&header, 0, sizeof (header));
+
   if (fb->byteswap)
     {
       header.signature[0] = GVDB_SWAPPED_SIGNATURE0;