gpasswd: 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/gpasswd.c

@@ -32,8 +32,9 @@
 #endif
 /*@-exitarg@*/
 #include "exitcodes.h"
-
 #include "shadowlog.h"
+#include "strlcpy.h"
+
 /*
  * Global variables
  */
@@ -895,7 +896,7 @@ static void change_passwd (struct group *gr)
 			exit (1);
 		}
 
-		STRFCPY (pass, cp);
+		STRLCPY(pass, cp);
 		erase_pass (cp);
 		cp = agetpass (_("Re-enter new password: "));
 		if (NULL == cp) {