mg.c: Fix OS2 compilation error

This was spotted by code reading and not by any real box to try this on.
It shows that OS2 can't have been successfully compiled on blead for
some time.

1 files changed, 1 insertions, 1 deletions

diff --git a/mg.c b/mg.c
index 530cb9f05b..c63a2a713e 100644
--- a/mg.c
+++ b/mg.c
@@ -916,7 +916,7 @@ Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
             sv_setnv(sv, (NV)errno);
             if (errno) {
                 utf8ness_t utf8ness;
-                const char * errstr = my_strerror(errnum, &utf8ness);
+                const char * errstr = my_strerror(errno, &utf8ness);
 
                 sv_setpv(sv, errstr);