patch 8.2.0871: cannot use getmarklist() as a method

Problem:    Cannot use getmarklist() as a method.
Solution:   Make getmarklist() work as a method.  Add one to the column
            number to match getpos(). (Yegappan Lakshmanan, closes #6176)
diff --git a/src/evalfunc.c b/src/evalfunc.c
index 92d6c06..92cd4a4 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -579,7 +579,7 @@
     {"getjumplist",	0, 2, FEARG_1,	  ret_list_any,	f_getjumplist},
     {"getline",		1, 2, FEARG_1,	  ret_f_getline, f_getline},
     {"getloclist",	1, 2, 0,	  ret_list_dict_any, f_getloclist},
-    {"getmarklist",	0, 1, 0,	  ret_list_dict_any,  f_getmarklist},
+    {"getmarklist",	0, 1, FEARG_1,	  ret_list_dict_any,  f_getmarklist},
     {"getmatches",	0, 1, 0,	  ret_list_dict_any, f_getmatches},
     {"getmousepos",	0, 0, 0,	  ret_dict_number, f_getmousepos},
     {"getpid",		0, 0, 0,	  ret_number,	f_getpid},