Add noreturn attribute to Syntax function

Suggested by clang:
xgamma.c:48:1: warning: function 'Syntax' could be declared with attribute
      'noreturn' [-Wmissing-noreturn]
{

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

1 files changed, 1 insertions, 1 deletions

diff --git a/xgamma.c b/xgamma.c
index a9d2c3f..6db07ef 100644
--- a/xgamma.c
+++ b/xgamma.c
@@ -43,7 +43,7 @@ static int EventBase, ErrorBase;
 #define GAMMA_MIN 0.1
 #define GAMMA_MAX 10.0
 
-static void 
+static void _X_NORETURN
 Syntax(void)
 {
     fprintf (stderr, "usage:  %s [-options]\n\n",