patch 8.1.1894: not checking for out-of-memory of autoload_name()

Problem:    Not checking for out-of-memory of autoload_name().
Solution:   Check for NULL. (Dominique Pelle, closes #4846)
diff --git a/src/version.c b/src/version.c
index b7ceb36..019ce25 100644
--- a/src/version.c
+++ b/src/version.c
@@ -766,6 +766,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1894,
+/**/
     1893,
 /**/
     1892,