patch 8.2.3241: Vim9: memory leak when function reports an error

Problem:    Vim9: memory leak when function reports an error.
Solution:   Clear the return value.

Author: brammool

src/userfunc.c

@@ -1691,9 +1691,12 @@ get_func_tv(
 
 	ret = call_func(name, len, rettv, argcount, argvars, funcexe);
 	if (in_vim9script() && did_emsg > did_emsg_before)
+	{
 	    // An error in a builtin function does not return FAIL, but we do
 	    // want to abort further processing if an error was given.
 	    ret = FAIL;
+	    clear_tv(rettv);
+	}
 
 	funcargs.ga_len -= i;
     }

src/version.c

@@ -755,6 +755,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3241,
 /**/
     3240,
 /**/