spirv: Stop counting inputs in entry_point_wrapper

nir_shader::num_inputs isn't supposed to be a count of how many input
variables we have.  It's a size of the lowered input space.

Reviewed-by: Karol Herbst <kherbst@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6472>
diff --git a/src/compiler/spirv/spirv_to_nir.c b/src/compiler/spirv/spirv_to_nir.c
index 6bd87bf..1660611 100644
--- a/src/compiler/spirv/spirv_to_nir.c
+++ b/src/compiler/spirv/spirv_to_nir.c
@@ -5574,8 +5574,6 @@
    const char *func_name =
       ralloc_asprintf(b->shader, "__wrapped_%s", entry_point->name);
 
-   /* we shouldn't have any inputs yet */
-   vtn_assert(!entry_point->shader->num_inputs);
    vtn_assert(b->shader->info.stage == MESA_SHADER_KERNEL);
 
    nir_function *main_entry_point = nir_function_create(b->shader, func_name);
@@ -5618,7 +5616,6 @@
          in_var->type = param_type->type;
 
       nir_shader_add_variable(b->nb.shader, in_var);
-      b->nb.shader->num_inputs++;
 
       /* we have to copy the entire variable into function memory */
       if (is_by_val) {