video: fbdev: s3c-fb: Fix kernel-doc and set but not used warnings

Fix several W=1 warnings
- Updated kernel-doc as needed
- Deleted unused local variable, it was assigned but never used

v2:
- Updated subject (Lee)

Signed-off-by: Sam Ravnborg <[e-mail]>
Acked-by: Thomas Zimmermann <[e-mail]>
Cc: Jingoo Han <[e-mail]>
Cc: [e-mail]
Cc: Lee Jones <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/video/fbdev/s3c-fb.c

···
  * @buf_size: Offset of buffer size registers.
  * @buf_end: Offset of buffer end registers.
  * @osd: The base for the OSD registers.
+ * @osd_stride: stride of osd
  * @palette: Address of palette memory, or 0 if none.
  * @has_prtcon: Set if has PRTCON register.
  * @has_shadowcon: Set if has SHADOWCON register.
···
  * @windata: The platform data supplied for the window configuration.
  * @parent: The hardware that this window is part of.
  * @fbinfo: Pointer pack to the framebuffer info for this window.
- * @varint: The variant information for this window.
+ * @variant: The variant information for this window.
  * @palette_buffer: Buffer/cache to hold palette entries.
  * @pseudo_palette: For use in TRUECOLOUR modes for entries 0..15/
  * @index: The window number of this window.
···
 /**
  * s3c_fb_calc_pixclk() - calculate the divider to create the pixel clock.
  * @sfb: The hardware state.
- * @pixclock: The pixel clock wanted, in picoseconds.
+ * @pixclk: The pixel clock wanted, in picoseconds.
  *
  * Given the specified pixel clock, work out the necessary divider to get
  * close to the output frequency.
···
  * @red: The red field for the palette data.
  * @green: The green field for the palette data.
  * @blue: The blue field for the palette data.
- * @trans: The transparency (alpha) field for the palette data.
+ * @transp: The transparency (alpha) field for the palette data.
  * @info: The framebuffer being changed.
  */
 static int s3c_fb_setcolreg(unsigned regno,
···
 
 /**
  * s3c_fb_release_win() - release resources for a framebuffer window.
+ * @sfb: The base resources for the hardware.
  * @win: The window to cleanup the resources for.
  *
  * Release the resources that where claimed for the hardware window,
···
 /**
  * s3c_fb_probe_win() - register an hardware window
  * @sfb: The base resources for the hardware
+ * @win_no: The window number
  * @variant: The variant information for this window.
  * @res: Pointer to where to place the resultant window.
  *
···
 			    struct s3c_fb_win_variant *variant,
 			    struct s3c_fb_win **res)
 {
-	struct fb_var_screeninfo *var;
 	struct fb_videomode initmode;
 	struct s3c_fb_pd_win *windata;
 	struct s3c_fb_win *win;
···
 
 	win = fbinfo->par;
 	*res = win;
-	var = &fbinfo->var;
 	win->variant = *variant;
 	win->fbinfo = fbinfo;
 	win->parent = sfb;