video: fbdev: tgafb: Fix kernel-doc and set but not used warnings

Fix W=1 warnings:
- Fix kernel-doc
- Drop unused code

v2:
- Updated subject (Lee)

Signed-off-by: Sam Ravnborg <[e-mail]>
Acked-by: Thomas Zimmermann <[e-mail]>
Cc: Sam Ravnborg <[e-mail]>
Cc: Jani Nikula <[e-mail]>
Cc: Bartlomiej Zolnierkiewicz <[e-mail]>
Cc: Daniel Vetter <[e-mail]>
Cc: Arnd Bergmann <[e-mail]>
Cc: Joe Perches <[e-mail]>
Cc: Lee Jones <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/video/fbdev/tgafb.c

···
 
 /**
  *      tgafb_blank - Optional function.  Blanks the display.
- *      @blank_mode: the blank mode we want.
+ *      @blank: the blank mode we want.
  *      @info: frame buffer structure that represents a single frame buffer
  */
 static int
···
 	u32 *palette = ((u32 *)info->pseudo_palette);
 	unsigned long pos, line_length, i, j;
 	const unsigned char *data;
-	void __iomem *regs_base, *fb_base;
+	void __iomem *fb_base;
 
 	dx = image->dx;
 	dy = image->dy;
···
 	if (dy + height > vyres)
 		height = vyres - dy;
 
-	regs_base = par->tga_regs_base;
 	fb_base = par->tga_fb_base;
 
 	pos = dy * line_length + (dx * 4);
···
 		     regs_base + TGA_MODE_REG);
 }
 
-/**
+/*
  *      tgafb_copyarea - REQUIRED function. Can use generic routines if
  *                       non acclerated hardware and packed pixel based.
  *                       Copies on area of the screen to another area.