Fix fallthrough warnings in sh776fb.c:

../drivers/video/fbdev/sh7760fb.c: In function 'sh7760fb_get_color_info':
../drivers/video/fbdev/sh7760fb.c:138:23: warning: this statement may fall 
through [-Wimplicit-fallthrough=]
  138 |                 lgray = 1;
../drivers/video/fbdev/sh7760fb.c:143:23: warning: this statement may fall 
through [-Wimplicit-fallthrough=]
  143 |                 lgray = 1;

Just document the current state of code execution/flow.

Fixes: 4a25e41831ee ("video: sh7760fb: SH7760/SH7763 LCDC framebuffer driver")
Signed-off-by: Randy Dunlap <[email protected]>
Cc: "Gustavo A. R. Silva" <[email protected]>
Cc: Nobuhiro Iwamatsu <[email protected]>
Cc: Manuel Lauss <[email protected]>
Cc: Yoshinori Sato <[email protected]>
Cc: Rich Felker <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
---
 drivers/video/fbdev/sh7760fb.c |    2 ++
 1 file changed, 2 insertions(+)

--- linux-next-20211112.orig/drivers/video/fbdev/sh7760fb.c
+++ linux-next-20211112/drivers/video/fbdev/sh7760fb.c
@@ -136,11 +136,13 @@ static int sh7760fb_get_color_info(struc
                break;
        case LDDFR_4BPP_MONO:
                lgray = 1;
+               fallthrough;
        case LDDFR_4BPP:
                lbpp = 4;
                break;
        case LDDFR_6BPP_MONO:
                lgray = 1;
+               fallthrough;
        case LDDFR_8BPP:
                lbpp = 8;
                break;

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