drm/vkms: Fix vmap_count increment position

Move vmap_count out of the conditional statement since it needs
to be updated for every successful call to vkms_gem_vmap.

Signed-off-by: Haneen Mohammed <hamohammed.sa@gmail.com>
Fixes: bb112b14af8d ("drm/vkms: Add functions to map/unmap GEM backing storage")
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180801090807.GA4611@haneenDRM

drivers/gpu/drm/vkms/vkms_gem.c

@@ -239,10 +239,9 @@ int vkms_gem_vmap(struct drm_gem_object *obj)
 		vkms_obj->vaddr = vmap(pages, n_pages, VM_MAP, PAGE_KERNEL);
 		if (!vkms_obj->vaddr)
 			goto err_vmap;
-
-		vkms_obj->vmap_count++;
 	}
 
+	vkms_obj->vmap_count++;
 	goto out;
 
 err_vmap: