vga_switcheroo: Fix error without CONFIG_VGA_SWITCHEROO

Fix a typo that is built only when CONFIG_VGA_SWITCHEROO=n.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

include/linux/vga_switcheroo.h

@@ -67,7 +67,7 @@ static inline int vga_switcheroo_register_audio_client(struct pci_dev *pdev,
 	int id, bool active) { return 0; }
 static inline void vga_switcheroo_unregister_handler(void) {}
 static inline int vga_switcheroo_process_delayed_switch(void) { return 0; }
-static inline int vga_switcheroo_get_client_state(struct pci_dev *dev) { return VGA_SWITCHEROO_CLIENT_ON; }
+static inline int vga_switcheroo_get_client_state(struct pci_dev *dev) { return VGA_SWITCHEROO_ON; }
 
 
 #endif