fbmon: remove unused function argument

When building with "make W=1", we get a warning about an empty stub
function that does nothing but reassign its one of its arguments:

  drivers/video/fbdev/core/fbmon.c: In function 'fb_edid_to_monspecs':
  drivers/video/fbdev/core/fbmon.c:1497:67: error: parameter 'specs' set but not used [-Werror=unused-but-set-parameter]

We can simply make that function completely empty to avoid the warning.

This prevents a warning which everyone will see after "CFLAGS: add
-Wunused-but-set-parameter" is merged.

Link: http://lkml.kernel.org/r/20160715203229.1771162-1-arnd@arndb.de
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/video/fbdev/core/fbmon.c

@@ -1496,7 +1496,6 @@ int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
 }
 void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs)
 {
-	specs = NULL;
 }
 void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs)
 {