Fix troffo.

man/zip_file_add.mdoc

diff --git a/man/zip_file_add.mdoc b/man/zip_file_add.mdoc
index 26be436..0c4cb05 100644
--- a/man/zip_file_add.mdoc
+++ b/man/zip_file_add.mdoc
@@ -110,7 +110,7 @@
 if ((s=zip_source_buffer(archive, buffer, len)) == NULL ||
     zip_file_add(archive, name, s, ZIP_FL_ENC_UTF_8) \*[Lt] 0) {
     zip_source_free(s);
-    printf("error adding file: %s\n", zip_strerror(archive));
+    printf("error adding file: %s\en", zip_strerror(archive));
 }
 .Ed
 .Sh ERRORS