Bug #29325: create table overwrites .MYD file of other

table (datadir)
Set errno when retunring an error in my_create_with_symlink.

mysys/my_symlink2.c

@@ -52,11 +52,13 @@ File my_create_with_symlink(const char *linkname, const char *filename,
   {
     if (!access(filename,F_OK))
     {
+      my_errno= errno= EEXIST;
       my_error(EE_CANTCREATEFILE, MYF(0), filename, EEXIST);
       DBUG_RETURN(-1);
     }
     if (create_link && !access(linkname,F_OK))
     {
+      my_errno= errno= EEXIST;
       my_error(EE_CANTCREATEFILE, MYF(0), linkname, EEXIST);
       DBUG_RETURN(-1);
     }