Fixes

- Adjust gfx controller to assume that the graphics driver is loaded if the
  mode is set for nvidia/hybrid
- Small code adjustments for error handling

Cargo.lock

@@ -29,7 +29,7 @@ checksum = "23b62fc65de8e4e7f52534fb52b0f3ed04746ae267519eef2a83941e8085068b"
 
 [[package]]
 name = "asus-nb"
-version = "2.1.1"
+version = "2.1.2"
 dependencies = [
  "ctrl-gfx",
  "dbus",
@@ -46,7 +46,7 @@ dependencies = [
 
 [[package]]
 name = "asus-nb-ctrl"
-version = "2.1.1"
+version = "2.1.2"
 dependencies = [
  "asus-nb",
  "ctrl-gfx",
@@ -232,7 +232,7 @@ dependencies = [
 
 [[package]]
 name = "ctrl-gfx"
-version = "2.1.3"
+version = "2.1.4"
 dependencies = [
  "log",
  "sysfs-class",