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Fix calculation of nested structs

We have to increment the number of nested tags only when we have
a struct declaration, not always the word struct happens in the code.

--- a/decl.c

+++ b/decl.c

@@ -130,12 +130,12 @@

 	if (nested_tags == NR_STRUCT_LEVEL)

 		error("too much nested structs/unions");

-	++nested_tags;

 	if (!accept('{'))

 		return;

 	if (!tp->forward)

 		error("struct/union already defined");

+	++nested_tags;

 	do

 		fielddcl(tp->ns);

 	while (!accept('}'));