Fix -Wsign-compare warning in Syntax() function

Reported by gcc 7.3:
xcalc.c: In function ‘Syntax’:
xcalc.c:322:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (i=0; i < XtNumber(Options); i++)
                 ^

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

1 files changed, 2 insertions, 4 deletions

diff --git a/xcalc.c b/xcalc.c
index d5d980f..f3ca18f 100644
--- a/xcalc.c
+++ b/xcalc.c
@@ -312,14 +312,12 @@ void Quit(void)
  */
 static void Syntax(int argc, char **argv)
 {
-    register int i;
-
     (void) fprintf(stderr, "%s: unknown options:", argv[0]);
-    for (i=1; i <argc; i++)
+    for (int i = 1; i <argc; i++)
 	(void) fprintf(stderr, " %s", argv[i]);
     (void) fprintf(stderr, "\n\n");
     (void) fprintf(stderr, "Usage:  %s", argv[0]);
-    for (i=0; i < XtNumber(Options); i++)
+    for (Cardinal i = 0; i < XtNumber(Options); i++)
 	(void) fprintf(stderr, " [%s]", Options[i].option);
     (void) fprintf(stderr, "\n");
     XtDestroyApplicationContext(xtcontext);