staging: sm750fb: print error message with actual value

This patch will update error message, so it is same as error message in
another function.

Signed-off-by: Matej Dujava <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/sm750fb/sm750.c

···
 	var->accel_flags = 0;/*FB_ACCELF_TEXT;*/
 
 	if (ret) {
-		pr_err("pixel bpp format not satisfied\n.");
+		pr_err("bpp %d not supported\n", var->bits_per_pixel);
 		return ret;
 	}
 	ret = hw_sm750_crtc_setMode(crtc, var, fix);