Audit fold(1)

1) Use num-wording in the manpage, remove offensive remark against
   the beloved -num-syntax <3.
2) Style changes.
3) Report errors of getline.
4) argv-argc-centric argument loop.
5) Rename r to ret for consistency.

fold.1

@@ -1,4 +1,4 @@
-.Dd March 5, 2015
+.Dd March 13, 2015
 .Dt FOLD 1
 .Os sbase
 .Sh NAME
@@ -7,7 +7,7 @@
 .Sh SYNOPSIS
 .Nm
 .Op Fl bs
-.Op Fl w Ar width | Fl Ns Ar width
+.Op Fl w Ar num | Fl Ns Ar num
 .Op Ar file ...
 .Sh DESCRIPTION
 .Nm
@@ -24,11 +24,10 @@ reads from stdin.
 Count bytes rather than characters.
 .It Fl s
 If a line contains spaces, break
-at the last space within
-.Ar width .
-.It Fl w Ar width | Fl Ns Ar width
+at the last space within width.
+.It Fl w Ar num | Fl Ns Ar num
 Break at
-.Ar width
+.Ar num
 characters. Default is 80.
 .El
 .Sh STANDARDS
@@ -38,6 +37,6 @@ utility is compliant with the
 .St -p1003.1-2008
 specification.
 .Pp
-The obsolete
-.Op Fl Ns Ar width
+The
+.Op Fl Ns Ar num
 syntax is an extension to that specification.