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Allow conversions to void

This is a valid cast from scalar types to void,
so thiy must be accepted.

--- a/expr.c

+++ b/expr.c

@@ -114,7 +114,7 @@

 		case PTR:

 			if (!iscast || np->typeop == FLOAT)

 				return NULL;

-		case INT: case FLOAT: case ENUM:

+		case INT: case FLOAT: case ENUM: case VOID:

 			break;

 		default:

 			return NULL;

@@ -122,7 +122,7 @@

 		break;

 	case PTR:

 		switch (t) {

-		case ENUM: case INT: /* TODO: allow p = 0 */

+		case ENUM: case INT: case VOID: /* TODO: allow p = 0 */

 			if (!iscast)

 				return NULL;;

 			break;