Revert part of 2efab60d9

As Karl Williamson pointed out in <5296C04E.10103@khwilliamson.com>,
sv_setpv will do SvOK_off if Strerror returns null, so this SvOK check
is not redundant.

diff --git a/mg.c b/mg.c
index 3f6eb2c..4b1deaf 100644 (file)
--- a/mg.c
+++ b/mg.c
@@ -849,7 +849,7 @@ Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
             sv_setnv(sv, (NV)Perl_rc);
             sv_setpv(sv, os2error(Perl_rc));
         }
-        if (strNE(SvPVX(sv), "")) {
+        if (SvOK(sv) && strNE(SvPVX(sv), "")) {
             fixup_errno_string(sv);
         }
 #   elif defined(WIN32)