Fix a potential infinite loop with getopt

The loop

  while ( ( c = getopt( argc, argv, ... ) ) != -1 )

never ends if c is a char, and the char type is unsigned by default.

Reported by Mickael GARDET <m.gardet@overkiz.com> for an ARM-32 system.

1 files changed, 1 insertions, 1 deletions

diff --git a/ntptest.c b/ntptest.c
index 2425319..d33d7eb 100755
--- a/ntptest.c
+++ b/ntptest.c
@@ -429,7 +429,7 @@ void usage( void )
 static /*HDR*/
 void check_options( int argc, char *argv[] )
 {
-  char c;
+  int c;
 
   #if defined( MBG_TGT_WIN32 )
     #define WIN32_OPTS  "L"