miscellaneous: clean up trailing whitespace once again

An earlier commit attempted to cleanse our environment
of all useless trailing whitespace. But the effort did
not catch 'empty' lines with a single space before ^J.

This commit hopefully finishes off the earlier effort.
In the meantime, let's pray that contributors' editors
are configured so that such wasted crap is disallowed!

Reference(s):
commit fe75e26ab6

Signed-off-by: Jim Warner <james.warner@comcast.net>

w.c

@@ -142,12 +142,12 @@ static void print_display_or_interface(const char *restrict host, int len, int r
 				fputc('-', stdout);
 			}
 		} else { /* multiple colons found - it's an IPv6 address */
-	
+
 			/* search for % (interface separator in case of IPv6 link address) */
 			while ( (tmp < (host + len)) && (*tmp != '%') && isprint(*tmp) ) tmp++;
 
 			if (*tmp == '%') { /* interface separator found */
-	
+
 				/* number of chars till the end of the input field */
 				len -= (tmp - host);