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Assert that wrapper_handler()'s argument is within expected range.

pqsignal() already does a similar check, but strange Valgrindreports have us wondering if wrapper_handler() is somehow gettingcalled with an invalid signal number.Reported-by: Tomas Vondra <tomas@vondra.me>Suggested-by: Andres Freund <andres@anarazel.de>Discussion:https://postgr.es/m/ace01111-f9ac-4f61-b1b1-8e9379415444%40vondra.meBackpatch-through: 17

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- pqsignal.c

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`‎src/port/pqsignal.c`

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Original file line number	Diff line number	Diff line change
`@@ -87,6 +87,9 @@ wrapper_handler(SIGNAL_ARGS)`
`87`	`87`	`{`
`88`	`88`	`intsave_errno=errno;`
`89`	`89`
	`90`	`+Assert(postgres_signal_arg>0);`
	`91`	`+Assert(postgres_signal_arg<PG_NSIG);`
	`92`	`+`
`90`	`93`	`#ifndefFRONTEND`
`91`	`94`
`92`	`95`	`/*`
`@@ -139,6 +142,7 @@ pqsignal(int signo, pqsigfunc func)`
`139`	`142`	`pqsigfuncret;`
`140`	`143`	`#endif`
`141`	`144`
	`145`	`+Assert(signo>0);`
`142`	`146`	`Assert(signo<PG_NSIG);`
`143`	`147`
`144`	`148`	`if (func!=SIG_IGN&&func!=SIG_DFL)`

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Commitc3510cf

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`‎src/port/pqsignal.c`

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