remove bogus assertion in DeleteTexture() function

src/mesa/drivers/dri/i810/i810tex.c

@@ -419,7 +419,6 @@ static void i810BindTexture( GLcontext *ctx, GLenum target,
 static void i810DeleteTexture( GLcontext *ctx, struct gl_texture_object *tObj )
 {
    driTextureObject * t = (driTextureObject *) tObj->DriverData;
-   assert(t);
    if (t) {
       i810ContextPtr imesa = I810_CONTEXT( ctx );
       if (imesa)

src/mesa/drivers/dri/i830/i830_tex.c

@@ -428,7 +428,6 @@ static void i830BindTexture( GLcontext *ctx, GLenum target,
 static void i830DeleteTexture( GLcontext *ctx, struct gl_texture_object *tObj )
 {
    driTextureObject * t = (driTextureObject *) tObj->DriverData;
-   assert(t);
    if ( t != NULL ) {
       i830ContextPtr imesa = I830_CONTEXT( ctx );
 

src/mesa/drivers/dri/mga/mgatex.c

@@ -495,7 +495,6 @@ mgaDeleteTexture( GLcontext *ctx, struct gl_texture_object *tObj )
    mgaContextPtr mmesa = MGA_CONTEXT( ctx );
    driTextureObject * t = (driTextureObject *) tObj->DriverData;
 
-   assert(t);
    if ( t ) {
       if ( mmesa ) {
 	 FLUSH_BATCH( mmesa );

src/mesa/drivers/dri/r128/r128_tex.c

@@ -572,7 +572,6 @@ static void r128DeleteTexture( GLcontext *ctx,
    r128ContextPtr rmesa = R128_CONTEXT(ctx);
    driTextureObject * t = (driTextureObject *) tObj->DriverData;
 
-   assert(t);
    if ( t ) {
       if ( t->bound && rmesa ) {
 	 FLUSH_BATCH( rmesa );

src/mesa/drivers/dri/r200/r200_tex.c

@@ -959,8 +959,6 @@ static void r200DeleteTexture( GLcontext *ctx,
    r200ContextPtr rmesa = R200_CONTEXT(ctx);
    driTextureObject * t = (driTextureObject *) texObj->DriverData;
 
-   assert(t);
-
    if ( R200_DEBUG & (DEBUG_STATE|DEBUG_TEXTURE) ) {
       fprintf( stderr, "%s( %p (target = %s) )\n", __FUNCTION__, (void *)texObj,
 	       _mesa_lookup_enum_by_nr( texObj->Target ) );

src/mesa/drivers/dri/radeon/radeon_tex.c

@@ -691,7 +691,6 @@ static void radeonDeleteTexture( GLcontext *ctx,
 	       _mesa_lookup_enum_by_nr( texObj->Target ) );
    }
 
-   assert(t);
    if ( t != NULL ) {
       if ( rmesa ) {
          RADEON_FIREVERTICES( rmesa );