fwscanf(3) returns ZERO instead of EOF when encountering an early matching failur

[Kevin Lo]

Hi,

The diff below from FreeBSD r326635 fixes the return value of fwscanf(3)
when encountering an early matching failure as the PR noted:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202240

Index: lib/libc/stdio/vfwscanf.c
===================================================================
RCS file: /cvs/src/lib/libc/stdio/vfwscanf.c,v
retrieving revision 1.6
diff -u -p -u -p -r1.6 vfwscanf.c
--- lib/libc/stdio/vfwscanf.c   30 Oct 2016 05:07:06 -0000      1.6
+++ lib/libc/stdio/vfwscanf.c   7 Dec 2017 02:17:51 -0000
@@ -165,7 +165,7 @@ literal:
                                goto input_failure;
                        if (wi != c) {
                                __ungetwc(wi, fp);
-                               goto input_failure;
+                               goto match_failure;
                        }
                        nread++;
                        continue;