re PR go/61746 (A line starting with /*// causes an error even if the /* is…

re PR go/61746 (A line starting with /*// causes an error even if the /* is closed on the next line)

	PR go/61746
compiler: Fix C-style comment parsing.

The compiler was incorrectly seeing /*/ as a complete C-style
comment.

From-SVN: r212370

gcc/go/gofrontend/lex.cc

@@ -598,7 +598,7 @@ Lex::next_token()
 		}
 	      else if (p[1] == '*')
 		{
-		  this->lineoff_ = p - this->linebuf_;
+		  this->lineoff_ = p + 2 - this->linebuf_;
 		  Location location = this->location();
 		  if (!this->skip_c_comment())
 		    return Token::make_invalid_token(location);