n is ignored in the mbstowcs() call, so it can be 0 instead of

(size_t)-1


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@2721 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

src/chars.c

@@ -858,7 +858,7 @@ bool is_valid_mbstring(const char *s)
     return 
 #ifdef NANO_WIDE
 	ISSET(USE_UTF8) ?
-	(mbstowcs(NULL, s, (size_t)-1) != (size_t)-1) :
+	(mbstowcs(NULL, s, 0) != (size_t)-1) :
 #endif
 
 	TRUE;