I'd put down $10 says the author did a last minute tweak to awkgram.y (which

had an error in it), and applied it by hand to awkgram.c (getting it right)
rather than really generating an new awkgram.c properly using Bison/YACC...
Fix his mistake here.

contrib/awk/awkgram.y

@@ -438,7 +438,7 @@ statement
 		{
 			$$ = node($3, $1, $5);
 			if ($$->type == Node_K_printf)
-				count_args($$)
+				count_args($$);
 		}
 	| print opt_rexpression_list output_redir statement_term
 		{
@@ -460,7 +460,7 @@ statement
 
 			$$ = node($2, $1, $3);
 			if ($$->type == Node_K_printf)
-				count_args($$)
+				count_args($$);
 		}
 	| LEX_NEXT statement_term
 		{ NODETYPE type;