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Decay expressions in assignop()

assignop() is called in any of the operator where an lvalue is
modified (=, *=, += ...). In this case is necessary decay the
right part of the expression, because in other case we will
generate code of assignment of arrays and functions.

--- a/cc1/expr.c

+++ b/cc1/expr.c

@@ -329,8 +329,14 @@

 static Node *

 assignop(char op, Node *np1, Node *np2)

 {

-	if ((np2 = convert(np2, np1->type, 0)) == NULL)

-		error("incompatible types when assigning");

+	switch (np2->type->op) {

+	case FTN: case ARY:

+		np2 = decay(np2);

+		/* PASSTHROUGH */

+	default:

+		if ((np2 = convert(np2, np1->type, 0)) == NULL)

+			error("incompatible types when assigning");

+	}

 	return bincode(op, np1->type, np1, np2);

 }