pvr: Fix segfault in pvr_CreatePipelineLayout when layout has zero bindings

Signed-off-by: Sarah Walker <sarah.walker@imgtec.com>
Reviewed-by: Frank Binns <frank.binns@imgtec.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19407>

src/imagination/vulkan/pvr_descriptor_set.c

@@ -893,6 +893,9 @@ VkResult pvr_CreatePipelineLayout(VkDevice _device,
             layout->descriptor_offsets[set_num][stage][type] =
                descriptor_counts[type];
 
+            if (!layout->set_layout[set_num]->descriptor_count)
+               continue;
+
             descriptor_count = layout->set_layout[set_num]
                                   ->per_stage_descriptor_count[stage][type];