video: fbdev: amifb: add FIXMEs about {put,get}_user() failures

Since we lack the hardware (or proper emulator setup) for
testing needed changes add FIXMEs to document the issues
(so at least they are not forgotten).

Cc: Al Viro <[e-mail]>
Reviewed-by: Geert Uytterhoeven <[e-mail]>
Signed-off-by: Bartlomiej Zolnierkiewicz <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/video/fbdev/amifb.c

···
 				 | ((datawords >> 15) & 1));
 			datawords <<= 1;
 #endif
+			/* FIXME: check the return value + test the change */
 			put_user(color, data++);
 		}
 		if (bits > 0) {
···
 		bits = 16; words = delta; datawords = 0;
 		for (width = (short)var->width - 1; width >= 0; width--) {
 			unsigned long tdata = 0;
+			/* FIXME: check the return value + test the change */
 			get_user(tdata, data);
 			data++;
 #ifdef __mc68000__