copy: handle EOPNOTSUPP from SEEK_DATA

* src/copy.c (infer_scantype): Ensure we don't error out
if SEEK_DATA returns EOPNOTSUPP, on systems where this value
is distinct from ENOTSUP.  Generally both of these should be checked.

diff --git a/src/copy.c b/src/copy.c
index 69ba94b11c7cce0d59024753aa70a7a5ea435b7b..f626cfed72f039715f1575a8c4e5f8522b26f462 100644 (file)
--- a/src/copy.c
+++ b/src/copy.c
@@ -1246,7 +1246,7 @@ infer_scantype (int fd, struct stat const *sb,
   scan_inference->ext_start = lseek (fd, 0, SEEK_DATA);
   if (0 <= scan_inference->ext_start)
     return LSEEK_SCANTYPE;
-  else if (errno != EINVAL && errno != ENOTSUP)
+  else if (errno != EINVAL && !is_ENOTSUP (errno))
     return errno == ENXIO ? LSEEK_SCANTYPE : ERROR_SCANTYPE;
 #endif