ddraw: Sign-compare warnings fix

[Andrew Talbot]

Changelog:
    ddraw: Sign-compare warnings fix.

diff --git a/dlls/ddraw/ddraw.c b/dlls/ddraw/ddraw.c
index 9fdbd27..3af4da4 100644
--- a/dlls/ddraw/ddraw.c
+++ b/dlls/ddraw/ddraw.c
@@ -1842,7 +1842,7 @@ D3D7CB_CreateSurface(IUnknown *device,
 {
     ICOM_THIS_FROM(IDirectDrawImpl, IDirectDraw7, device);
     IDirectDrawSurfaceImpl *surf = NULL;
-    int i = 0;
+    UINT i = 0;
     DDSCAPS2 searchcaps = This->tex_root->surface_desc.ddsCaps;
     TRACE("(%p) call back. surf=%p. Face %d level %d\n", device, This->tex_root, Face, level);
 
diff --git a/dlls/ddraw/device.c b/dlls/ddraw/device.c
index 84d55e0..cb0bda5 100644
--- a/dlls/ddraw/device.c
+++ b/dlls/ddraw/device.c
@@ -1165,7 +1165,7 @@ IDirect3DDeviceImpl_7_EnumTextureFormats(IDirect3DDevice7 *iface,
     ICOM_THIS_FROM(IDirect3DDeviceImpl, IDirect3DDevice7, iface);
     HRESULT hr;
     WINED3DDISPLAYMODE mode;
-    int i;
+    unsigned int i;
 
     WINED3DFORMAT FormatList[] = {
         /* 32 bit */
@@ -1328,7 +1328,7 @@ IDirect3DDeviceImpl_2_EnumTextureFormats(IDirect3DDevice2 *iface,
 {
     ICOM_THIS_FROM(IDirect3DDeviceImpl, IDirect3DDevice2, iface);
     HRESULT hr;
-    int i;
+    unsigned int i;
     WINED3DDISPLAYMODE mode;
 
     WINED3DFORMAT FormatList[] = {
@@ -3982,7 +3982,7 @@ IDirect3DDeviceImpl_7_DrawPrimitiveStrided(IDirect3DDevice7 *iface,
 {
     ICOM_THIS_FROM(IDirect3DDeviceImpl, IDirect3DDevice7, iface);
     WineDirect3DVertexStridedData WineD3DStrided;
-    int i;
+    DWORD i;
     UINT PrimitiveCount;
     HRESULT hr;
 
@@ -4160,7 +4160,7 @@ IDirect3DDeviceImpl_7_DrawIndexedPrimitiveStrided(IDirect3DDevice7 *iface,
 {
     ICOM_THIS_FROM(IDirect3DDeviceImpl, IDirect3DDevice7, iface);
     WineDirect3DVertexStridedData WineD3DStrided;
-    int i;
+    DWORD i;
     UINT PrimitiveCount;
     HRESULT hr;
 
diff --git a/dlls/ddraw/direct3d.c b/dlls/ddraw/direct3d.c
index d3ce886..5e21e5b 100644
--- a/dlls/ddraw/direct3d.c
+++ b/dlls/ddraw/direct3d.c
@@ -1138,7 +1138,7 @@ IDirect3DImpl_7_EnumZBufferFormats(IDirect3D7 *iface,
 {
     ICOM_THIS_FROM(IDirectDrawImpl, IDirect3D7, iface);
     HRESULT hr;
-    int i;
+    unsigned int i;
     WINED3DDISPLAYMODE d3ddm;
     WINED3DDEVTYPE type;
 
diff --git a/dlls/ddraw/utils.c b/dlls/ddraw/utils.c
index 937caa4..02d74c7 100644
--- a/dlls/ddraw/utils.c
+++ b/dlls/ddraw/utils.c
@@ -902,7 +902,7 @@ DWORD
 get_flexible_vertex_size(DWORD d3dvtVertexType)
 {
     DWORD size = 0;
-    int i;
+    DWORD i;
 
     if (d3dvtVertexType & D3DFVF_NORMAL) size += 3 * sizeof(D3DVALUE);
     if (d3dvtVertexType & D3DFVF_DIFFUSE) size += sizeof(DWORD);