tidy-up: misc build, tests, `lib/macos.c`

- mkhelp.pl: drop unused assigment.
- Makefile.mk: update a comment.
- lib/macos.c: delete redundant block.
- fix two typos.

Closes #14558

docs/TODO

@@ -252,7 +252,7 @@
 1.6 thread-safe sharing
 
  Using the share interface users can share some data between easy handles but
- several of the sharing options are documented as as not safe and supported to
+ several of the sharing options are documented as not safe and supported to
  share between multiple concurrent threads. Fixing this would enable more
  users to share data in more powerful ways.
 

lib/Makefile.mk

@@ -27,7 +27,7 @@
 # Usage:   make -f Makefile.mk CFG=-feat1[-feat2][-feat3][...]
 # Example: make -f Makefile.mk CFG=-zlib-ssl-libssh2-ipv6
 #
-# Look for ' ?=' to find all accepted customization variables.
+# Look for ' ?=' to find accepted customization variables.
 
 # This script is reused by 'src' and 'docs/examples' Makefile.mk scripts.
 

lib/macos.c

@@ -33,7 +33,6 @@
 #include <SystemConfiguration/SCDynamicStoreCopySpecific.h>
 
 CURLcode Curl_macos_init(void)
-{
 {
   /*
    * The automagic conversion from IPv4 literals to IPv6 literals only
@@ -48,7 +47,6 @@ CURLcode Curl_macos_init(void)
   CFDictionaryRef dict = SCDynamicStoreCopyProxies(NULL);
   if(dict)
     CFRelease(dict);
-  }
   return CURLE_OK;
 }
 

src/mkhelp.pl

@@ -34,7 +34,6 @@ push @out, "     / __| | | | |_) | |\n";
 push @out, "    | (__| |_| |  _ <| |___\n";
 push @out, "     \\___|\\___/|_| \\_\\_____|\n";
 
-my $olen=0;
 while (<STDIN>) {
     my $line = $_;
     push @out, $line;

tests/servers.pm

@@ -2323,7 +2323,7 @@ sub responsive_httptls_server {
 sub startservers {
     my @what = @_;
     my ($pid, $pid2);
-    my $serr;  # error while starting a server (as as the return enumerations)
+    my $serr;  # error while starting a server (as of the return enumerations)
     for(@what) {
         my (@whatlist) = split(/\s+/,$_);
         my $what = lc($whatlist[0]);