Handle clang -Wmissing-noreturn warning

xmore.c:137:1: warning: function 'usage' could be declared with
  attribute 'noreturn' [-Wmissing-noreturn]

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/xmore.c b/xmore.c
index f2f00c4..7d508ed 100644
--- a/xmore.c
+++ b/xmore.c
@@ -132,6 +132,7 @@ quitXtProc(Widget w, XtPointer client_data, XtPointer callData)
     XtCallActionProc(w, "quit", NULL, NULL, 0);
 }
 
+_X_NORETURN _X_COLD
 static void
 usage(FILE *out, int exitval)
 {