panvk: Fix null pointer dereference on cmd_buffer->ops
0x0000fffff757c368 in vk_command_buffer_recycle (cmd_buffer=cmd_buffer@entry=0xaaaaaae45f50) at ../src/vulkan/runtime/vk_command_buffer.c:109
109 cmd_buffer->ops->reset(cmd_buffer,
(gdb) bt
#0 0x0000fffff757c368 in vk_command_buffer_recycle (cmd_buffer=cmd_buffer@entry=0xaaaaaae45f50) at ../src/vulkan/runtime/vk_command_buffer.c:109
#1 0x0000fffff757ca2c in vk_command_buffer_recycle_or_destroy (cmd_buffer=0xaaaaaae45f50, pool=0xaaaaaae026a0) at ../src/vulkan/runtime/vk_command_pool.c:167
#2 vk_command_buffer_recycle_or_destroy (cmd_buffer=0xaaaaaae45f50, pool=0xaaaaaae026a0) at ../src/vulkan/runtime/vk_command_pool.c:161
#3 vk_common_FreeCommandBuffers (device=<optimized out>, commandPool=0xaaaaaae026a0, commandBufferCount=<optimized out>, pCommandBuffers=<optimized out>) at ../src/vulkan/runtime/vk_command_pool.c:243