tailk: fix error detected by testsuite

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/coreutils/tail.c b/coreutils/tail.c
index 83768d420..8fc22f562 100644
--- a/coreutils/tail.c
+++ b/coreutils/tail.c
@@ -241,7 +241,8 @@ int tail_main(int argc, char **argv)
                                                 } while (nwrite);
                                         }
                                 }
-                                xwrite(STDOUT_FILENO, buf + nread - nwrite, nwrite);
+                                if (nwrite > 0)
+                                        xwrite(STDOUT_FILENO, buf + nread - nwrite, nwrite);
                         } else if (count) {
                                 if (COUNT_BYTES) {
                                         taillen += nread;