Audit tail(1)

1) Specify default in manpage under flag.
2) Boolean and return value style fixes.
3) argv-argc-centric loop.
4) No need to check for argc == 1 before the fflag-subroutine.
5) Remove indentation.
6) Empty line before return.

tail.1

@@ -1,4 +1,4 @@
-.Dd March 5, 2015
+.Dd March 17, 2015
 .Dt TAIL 1
 .Os sbase
 .Sh NAME
@@ -31,7 +31,7 @@ it is an offset from the beginning of each
 .Ar file .
 If
 .Ar num
-begins with '-' it is as if no sign was given.
+begins with '-' it is as if no sign was given. The default is 10 lines.
 .It Fl f
 If one
 .Ar file