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libaml: fix uninitialized variable in getle(), make amleval() work with buildin methods

--- a/sys/src/libaml/aml.c

+++ b/sys/src/libaml/aml.c

@@ -460,6 +460,7 @@

 	uvlong v;

 	int i;

+	v = 0ULL;

 	for(i=0; i<len; i++)

 		v |= ((uvlong)p[i]) << i*8;

 	return v;

@@ -1504,7 +1505,7 @@

 	FP->env = e;

 	FP->narg = 0;

 	FP->dot = m->name;

-	if(m->eval){

+	if(m->eval != nil){

 		FP->op = nil;

 		FP->end = PC;

 		return (*m->eval)();

@@ -2187,7 +2188,15 @@

 		m = dot;

 		if(i != m->narg)

 			return -1;

-		return xec(m->start, m->end, forkname(m->name), e, r);

+		if(m->eval == nil)

+			return xec(m->start, m->end, forkname(m->name), e, r);

+		FP = FB;

+		FP->op = nil;

+		FP->env = e;

+		FP->narg = 0;

+		FP->dot = m->name;

+		FP->ref = FP->aux = nil;

+		dot = (*m->eval)();

 	}

 	if(r != nil)

 		*r = dot;

-- 

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