Fix parsing "@ (* )" (#1829).

* verilog-mode.el (verilog-read-decls): Fix parsing "@ (* )" (#1829).

Author: wsnyder

tests/autoarg_starparen.v

@@ -0,0 +1,12 @@
+// bug #1829
+module dut (/*autoarg*/);
+input clk;
+input rst_n;
+output logic d;
+
+always @(* )
+begin
+  d = 1'b0;
+end
+
+endmodule

tests_ok/autoarg_starparen.v

@@ -0,0 +1,17 @@
+// bug #1829
+module dut (/*autoarg*/
+            // Outputs
+            d,
+            // Inputs
+            clk, rst_n
+            );
+   input        clk;
+   input        rst_n;
+   output logic d;
+   
+   always @(* )
+     begin
+        d = 1'b0;
+     end
+   
+endmodule

verilog-mode.el

@@ -9323,7 +9323,8 @@ Return an array of [outputs inouts inputs wire reg assign const gparam intf]."
 	 ((looking-at "(\\*")
 	  ;; To advance past either "(*)" or "(* ... *)" don't forward past first *
 	  (forward-char 1)
-	  (or (search-forward "*)")
+	  (or (looking-at "\\*\\s-*)")  ; (* )
+              (search-forward "*)")  ; end attribute
 	      (error "%s: Unmatched (* *), at char %d" (verilog-point-text) (point))))
 	 ((eq ?\" (following-char))
           (or (re-search-forward "[^\\]\"" nil t)  ; don't forward-char first, since we look for a non backslash first