drm/msm: Small function param doc fix

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202507032334.9SCwc952-lkp@intel.com/
Signed-off-by: Rob Clark <robin.clark@oss.qualcomm.com>

Author: Rob Clark

drivers/gpu/drm/msm/msm_gem_vma.c

@@ -171,7 +171,7 @@ msm_gem_vm_free(struct drm_gpuvm *gpuvm)
 
 /**
  * msm_gem_vm_unusable() - Mark a VM as unusable
- * @vm: the VM to mark unusable
+ * @gpuvm: the VM to mark unusable
  */
 void
 msm_gem_vm_unusable(struct drm_gpuvm *gpuvm)