Small tidyup for commit d41a178, part II.

Further to commit 6a9229d, checking for NULL is now redundant.  An "out
of memory" error would have been thrown already by palloc() and treated
as FATAL, so we can delete a few more lines.

Back-patch to all releases, like those other commits.

Reported-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/4040668.1679013388%40sss.pgh.pa.us

Author: macdice

src/backend/postmaster/postmaster.c

@@ -4880,11 +4880,6 @@ internal_forkexec(int argc, char *argv[], Port *port)
 	 * freed by a later call to waitpid().
 	 */
 	childinfo = palloc(sizeof(win32_deadchild_waitinfo));
-	if (!childinfo)
-		ereport(FATAL,
-				(errcode(ERRCODE_OUT_OF_MEMORY),
-				 errmsg("out of memory")));
-
 	childinfo->procHandle = pi.hProcess;
 	childinfo->procId = pi.dwProcessId;