patch 9.1.2010: Missing out-of-memory checks in vim9class.c

Problem:  Missing out-of-memory checks in vim9class.c
          (after v9.1.2000)
Solution: Return FAIL early (John Marriott)

closes: #18991

Signed-off-by: John Marriott <basilisk@internode.on.net>
Signed-off-by: Christian Brabandt <cb@256bit.org>

Author: John Marriott

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2010,
 /**/
     2009,
 /**/

src/vim9class.c

@@ -179,7 +179,10 @@ add_member(
     m->ocm_name.length = (size_t)(varname_end - varname);
     m->ocm_name.string = vim_strnsave(varname, m->ocm_name.length);
     if (m->ocm_name.string == NULL)
+    {
 	m->ocm_name.length = 0;
+	return FAIL;
+    }
     m->ocm_access = has_public ? VIM_ACCESS_ALL
 		      : *varname == '_' ? VIM_ACCESS_PRIVATE : VIM_ACCESS_READ;
     if (has_final)
@@ -230,7 +233,10 @@ add_members_to_class(
 	*m = parent_members[i];
 	m->ocm_name.string = vim_strnsave(m->ocm_name.string, m->ocm_name.length);
 	if (m->ocm_name.string == NULL)
+	{
 	    m->ocm_name.length = 0;
+	    return FAIL;
+	}
 	if (m->ocm_init != NULL)
 	    m->ocm_init = vim_strsave(m->ocm_init);
     }