error_report() strings should not include trailing newlines.

Noticed running:

  $ spatch \
    --macro-file scripts/cocci-macro-file.h \
    --sp-file scripts/coccinelle/err-bad-newline.cocci \
    --keep-comments --use-gitgrep --dir .
  ./ui/gtk.c:1094:56:"gtk: unexpected touch event type\n"

Fixes: 5a4cb61ae1 ("ui/gtk: enable backend to send multi-touch events")
Inspired-by: Peter Maydell <[email protected]>
Signed-off-by: Philippe Mathieu-Daudé <[email protected]>
---
 ui/gtk.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ui/gtk.c b/ui/gtk.c
index 810d7fc796..c819c72a20 100644
--- a/ui/gtk.c
+++ b/ui/gtk.c
@@ -1091,7 +1091,7 @@ static gboolean gd_touch_event(GtkWidget *widget, 
GdkEventTouch *touch,
         type = INPUT_MULTI_TOUCH_TYPE_END;
         break;
     default:
-        warn_report("gtk: unexpected touch event type\n");
+        warn_report("gtk: unexpected touch event type");
         return FALSE;
     }
 
-- 
2.41.0


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