patch 8.2.0371: crash with combination of terminal popup and autocmd

Problem:    Crash with combination of terminal popup and autocmd.
Solution:   Disallow closing a popup that is the current window.  Add a check
            that the current buffer is valid. (closes #5754)
diff --git a/src/version.c b/src/version.c
index 34eb68f..eb76880 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    371,
+/**/
     370,
 /**/
     369,