[9front] getpid(2) patch

[9front] getpid(2) patch

[boehm.igor]

Fix inconsistency between man page of getpid() with its
implementation.

On 9front getpid() doesn't fail to generate a pid. Therefore it also
doesn't set errstr. Hence the text in the man page describing that
could be removed unless I am overlooking something.

If the text is left in, it suggests that one has to implement error
handling code for a situation that can never arise, at least not on
9front.

See '/sys/src/9/port/proc.c:1772: pidadd(long pid)' for details.

Thanks cinap for clearing up my initial confusion.

diff -r 568e6c7e12ac sys/man/2/getpid
--- a/sys/man/2/getpid	Wed Dec 23 02:32:13 2020 +0100
+++ b/sys/man/2/getpid	Wed Dec 23 15:04:09 2020 +0100
@@ -26,8 +26,3 @@
 .IR intro (2),
 .IR exec (2),
 .IR proc (3)
-.SH DIAGNOSTICS
-Returns 0 and
-sets
-.I errstr
-if unsuccessful.