sulogin: Replace STRFCPY() by STRLCPY()

The variable is only being read as a string (char *), so data after the
'\0' can't be leaked.

Cc: Christian Göttsche <cgzones@googlemail.com>
Cc: Serge Hallyn <serge@hallyn.com>
Cc: Iker Pedrosa <ipedrosa@redhat.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>

src/sulogin.c

@@ -24,6 +24,7 @@
 /*@-exitarg@*/
 #include "exitcodes.h"
 #include "shadowlog.h"
+#include "strlcpy.h"
 
 /*
  * Global variables
@@ -157,7 +158,7 @@ static void catch_signals (unused int sig)
 #endif
 			exit (0);
 		}
-		STRFCPY (pass, cp);
+		STRLCPY(pass, cp);
 		erase_pass (cp);
 
 		if (valid (pass, &pwent)) {	/* check encrypted passwords ... */