iris: initialize num_cbufs

Currently initialized only if 'ish' is non-NULL.

CID: 1444106
Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/gallium/drivers/iris/iris_program.c

@@ -712,7 +712,7 @@ iris_compile_tcs(struct iris_context *ice,
    struct brw_stage_prog_data *prog_data = &vue_prog_data->base;
    enum brw_param_builtin *system_values = NULL;
    unsigned num_system_values = 0;
-   unsigned num_cbufs;
+   unsigned num_cbufs = 0;
 
    nir_shader *nir;