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pc(1): always allocate at least one mpdigit (itomp assumes this)

--- a/sys/src/cmd/pc.y

+++ b/sys/src/cmd/pc.y

@@ -55,7 +55,7 @@

 	r = emalloc(sizeof(Num));

 	r->ref = 1;

-	r->p = emalloc(0);

+	r->p = emalloc(sizeof(mpdigit));

 	mpassign(mpzero, r);

 	return r;

 }