tailk: fix error detected by testsuite

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

diff --git a/coreutils/tail.c b/coreutils/tail.c
index 83768d4208c54470f2c2f5bdd467d77719e0218f..8fc22f562eff7c8b98eb6e3e54591baeb7b697ff 100644 (file)
--- 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;