video/cmdline: Hide __video_get_options() behind CONFIG_FB_CORE

The function __video_get_options() only exists for compatibility
with old fbdev drivers that cannot be refactored easily. Hide it
behind CONFIG_FB_CORE.

v2:
* support CONFIG_FB_CORE=m via IS_ENABLED() (kernel test robot)

Signed-off-by: Thomas Zimmermann <[e-mail]>
Reviewed-by: Daniel Vetter <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/video/cmdline.c

···
 }
 EXPORT_SYMBOL(video_get_options);
 
+#if IS_ENABLED(CONFIG_FB_CORE)
 bool __video_get_options(const char *name, const char **options, bool is_of)
 {
 	bool enabled = true;
···
 	return enabled;
 }
 EXPORT_SYMBOL(__video_get_options);
+#endif
 
 /*
  * Process command line options for video adapters. This function is

include/video/cmdline.h

···
 #ifndef VIDEO_CMDLINE_H
 #define VIDEO_CMDLINE_H
 
+#include <linux/kconfig.h>
 #include <linux/types.h>
 
 const char *video_get_options(const char *name);
 
+#if IS_ENABLED(CONFIG_FB_CORE)
 /* exported for compatibility with fbdev; don't use in new code */
 bool __video_get_options(const char *name, const char **option, bool is_of);
+#endif
 
 #endif