lavd/sdl: remove trailing dot in messages

This is consistent with the apparently prevailing convention.

libavdevice/sdl.c

@@ -84,7 +84,7 @@ static int sdl_write_header(AVFormatContext *s)
 
     if (SDL_WasInit(SDL_INIT_VIDEO)) {
         av_log(s, AV_LOG_ERROR,
-               "SDL video subsystem was already inited, aborting.\n");
+               "SDL video subsystem was already inited, aborting\n");
         sdl->sdl_was_already_inited = 1;
         ret = AVERROR(EINVAL);
         goto fail;
@@ -113,7 +113,7 @@ static int sdl_write_header(AVFormatContext *s)
 
     if (!sdl->overlay_fmt) {
         av_log(s, AV_LOG_ERROR,
-               "Unsupported pixel format '%s', choose one of yuv420p, yuyv422, or uyvy422.\n",
+               "Unsupported pixel format '%s', choose one of yuv420p, yuyv422, or uyvy422\n",
                av_get_pix_fmt_name(encctx->pix_fmt));
         ret = AVERROR(EINVAL);
         goto fail;
@@ -162,7 +162,7 @@ static int sdl_write_header(AVFormatContext *s)
                                         sdl->overlay_fmt, sdl->surface);
     if (!sdl->overlay || sdl->overlay->pitches[0] < encctx->width) {
         av_log(s, AV_LOG_ERROR,
-               "SDL does not support an overlay with size of %dx%d pixels.\n",
+               "SDL does not support an overlay with size of %dx%d pixels\n",
                encctx->width, encctx->height);
         ret = AVERROR(EINVAL);
         goto fail;