coverity: add a comment about "Argument cannot be negative"

"fd" is passed to a parameter that cannot be negative.

1 files changed, 1 insertions, 1 deletions

diff --git a/URPM.xs b/URPM.xs
index 03b11a2..287efbc 100644
--- a/URPM.xs
+++ b/URPM.xs
@@ -985,7 +985,7 @@ open_archive(char *filename, int *empty_archive) {
       }
     }
   }
-  close(fd);
+  close(fd); // we rely on EBADF in testsuite
   return rfd;
 }