patch 9.0.0174: no error for using "#{ comment" in a compiled function

Problem:    No error for using "#{ comment" in a compiled function.
Solution:   Make error checking for "#{" consistent. (closes #10855)

src/testdir/test_vim9_func.vim

@@ -74,6 +74,10 @@ def TestCompilingErrorInTry()
   delete('Xdir', 'rf')
 enddef
 
+def Test_comment_error()
+  v9.CheckDefFailure(['#{ comment'], 'E1170:')
+enddef
+
 def Test_compile_error_in_called_function()
   var lines =<< trim END
       vim9script

src/version.c

@@ -735,6 +735,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    174,
 /**/
     173,
 /**/

src/vim9compile.c

@@ -2899,7 +2899,9 @@ compile_def_function(
 
 	if (*ea.cmd == '#')
 	{
-	    // "#" starts a comment
+	    // "#" starts a comment, but "#{" is an error
+	    if (vim9_bad_comment(ea.cmd))
+		goto erret;
 	    line = (char_u *)"";
 	    continue;
 	}