fix signed vs unsigned comparison warnings in tnl_dd

src/mesa/tnl_dd/t_dd_triemit.h

@@ -143,7 +143,7 @@ static void TAG(fast_clipped_poly)( GLcontext *ctx, const GLuint *elts,
    GLuint vertsize = GET_VERTEX_DWORDS();
    GLuint *vb = (GLuint *)ALLOC_VERTS( (n-2) * 3, vertsize );
    const GLuint *start = (const GLuint *)VERT(elts[0]);
-   int i,j;
+   GLuint i,j;
 
    if (DO_DEBUG_VERTS) {
       fprintf(stderr, "%s\n", __FUNCTION__);

src/mesa/tnl_dd/t_dd_tritmp.h

@@ -749,7 +749,7 @@ static void TAG(line)( GLcontext *ctx, GLuint e0, GLuint e1 )
 static void TAG(points)( GLcontext *ctx, GLuint first, GLuint last )
 {
    struct vertex_buffer *VB = &TNL_CONTEXT( ctx )->vb;
-   int i;
+   GLuint i;
    LOCAL_VARS(1);
 
    if (VB->Elts == 0) {