postnews() bug (2.10.3), with fix

[Arthur David Olson]

> 		for (p=src; !isspace(*p)/*isalnum(*p) || ispunct(*p)*/; p++)
>			;

Since isspace('\0') is false (at least on our 4.1BSD system), our department
of defensive programming recommends that the above test take the form

> 		for (p=src; *p != '\0' && !isspace(*p); p++)
>			;
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