[Bug libc/30759] New: Comment on SPAWN_ERROR is wrong

["safinaskar at mail dot ru" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30759

            Bug ID: 30759
           Summary: Comment on SPAWN_ERROR is wrong
           Product: glibc
           Version: 2.40
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: safinaskar at mail dot ru
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

Consider
https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/spawni.c;h=ec687cb4238bac10a113ab924ea9b05500142b88;hb=1b214630ce6f7e0099b8b6f87246246739b079cf#l55
. The comment is wrong, because actual value of this macro (SPAWN_ERROR) in
fact is never used! Let me tell you why.

The only use site of this macro is
https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/spawni.c;h=ec687cb4238bac10a113ab924ea9b05500142b88;hb=1b214630ce6f7e0099b8b6f87246246739b079cf#l306
. But, as well as I understand in this place args->err is non-zero. Then in
parent we expect this args->err in line
https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/spawni.c;h=ec687cb4238bac10a113ab924ea9b05500142b88;hb=1b214630ce6f7e0099b8b6f87246246739b079cf#l417
. It is non-zero, so we fail to __waitpid. __waitpid doesn't save process
status, so the status (i. e. SPAWN_ERROR) is never observed.

So, I propose removing confusing comment. Also macro SPAWN_ERROR itself should
be removed, too. "_exit (SPAWN_ERROR)" should be replaced with "_exit(1) /*
This value is never observed */"

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