pg_regress: Remove unused variable

The restrictedToken handle was set but never read, so remove the
variable and change to a boolean style check to match other uses
of CreateRestrictedProcess().

Reviewed-by: Nathan Bossart <nathandbossart@gmail.com>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Discussion: https://postgr.es/m/62A63C81-3893-4E3F-A34E-2081DF67074E@yesql.se

Author: danielgustafsson

src/test/regress/pg_regress.c

@@ -1226,7 +1226,6 @@ spawn_process(const char *cmdline)
 #else
 	PROCESS_INFORMATION pi;
 	char	   *cmdline2;
-	HANDLE		restrictedToken;
 	const char *comspec;
 
 	/* Find CMD.EXE location using COMSPEC, if it's set */
@@ -1237,8 +1236,7 @@ spawn_process(const char *cmdline)
 	memset(&pi, 0, sizeof(pi));
 	cmdline2 = psprintf("\"%s\" /c \"%s\"", comspec, cmdline);
 
-	if ((restrictedToken =
-		 CreateRestrictedProcess(cmdline2, &pi)) == 0)
+	if (!CreateRestrictedProcess(cmdline2, &pi))
 		exit(2);
 
 	CloseHandle(pi.hThread);