(osys_read_record): If record->header.lenth <= sizeof (record->header),

then return rather than passing a negative (or zero) nelts to bfd_read.

bfd/oasys.c

@@ -40,6 +40,8 @@ DEFUN(oasys_read_record,(abfd, record),
 
   bfd_read(record, 1, sizeof(record->header), abfd);
 
+  if ((size_t) record->header.length <= (size_t) sizeof (record->header))
+    return;
   bfd_read(((char *)record )+ sizeof(record->header),
 	   1, record->header.length - sizeof(record->header),
 	   abfd);