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libc: initialize privalloc memory to zero

without this, it's very hard to use privalloc correctly.

--- a/sys/src/ape/lib/ap/plan9/callmain.c

+++ b/sys/src/ape/lib/ap/plan9/callmain.c

@@ -23,6 +23,7 @@

 	char err[ERRMAX];

 	void *privates[NPRIVATES];

+	memset(privates, 0, sizeof(privates));

 	err[0] = '\0';

 	_privates = privates;

 	_nprivates = NPRIVATES;

--- a/sys/src/libc/9sys/callmain.c

+++ b/sys/src/libc/9sys/callmain.c

@@ -15,6 +15,7 @@

 {

 	void *privates[NPRIVATES];

+	memset(privates, 0, sizeof(privates));

 	_privates = privates;

 	_nprivates = NPRIVATES;

 	main(argc, &arg0);

-- 

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