Part 1 of PR25561, fix compile warnings forgotten in actual commit.

From-SVN: r135379

libgfortran/io/fbuf.c

@@ -126,7 +126,7 @@ fbuf_seek (gfc_unit * u, gfc_offset off)
   if (pos < 0)
     return -1;
   u->fbuf->ptr = u->fbuf->buf + pos;
-  if (pos > u->fbuf->act)
+  if (pos > (gfc_offset) u->fbuf->act)
     u->fbuf->act = pos;
   return 0;
 }

libgfortran/io/transfer.c

@@ -2290,7 +2290,7 @@ skip_record (st_parameter_dt *dtp, size_t bytes)
 	{
 	  rlength = 
 	    (MAX_READ > (size_t) dtp->u.p.current_unit->bytes_left_subrecord) ?
-	    MAX_READ : dtp->u.p.current_unit->bytes_left_subrecord;
+	    MAX_READ : (size_t) dtp->u.p.current_unit->bytes_left_subrecord;
 
 	  if (sread (dtp->u.p.current_unit->s, p, &rlength) != 0)
 	    {