patch 8.2.1760: Vim9: crash when end marker is missing

Problem:    Vim9: crash when end marker is missing. (Dhiraj Mishra)
Solution:   Check for end of function lines. (closes #7031)

src/testdir/test_vim9_assign.vim

@@ -740,6 +740,22 @@ def Test_heredoc()
 
   CheckDefFailure(['var lines =<< trim END X', 'END'], 'E488:')
   CheckDefFailure(['var lines =<< trim END " comment', 'END'], 'E488:')
+
+  lines =<< trim [END]
+      def Func()
+        var&lines =<< trim END
+        x
+        x
+        x
+        x
+        x
+        x
+        x
+        x
+      enddef
+      call Func()
+  [END]
+  CheckScriptFailure(lines, 'E990:')
 enddef
 
 " vim: ts=8 sw=2 sts=2 expandtab tw=80 fdm=marker

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1760,
 /**/
     1759,
 /**/

src/vim9compile.c

@@ -4360,7 +4360,7 @@ exarg_getline(
 
     for (;;)
     {
-	if (cctx->ctx_lnum == cctx->ctx_ufunc->uf_lines.ga_len)
+	if (cctx->ctx_lnum >= cctx->ctx_ufunc->uf_lines.ga_len - 1)
 	    return NULL;
 	++cctx->ctx_lnum;
 	p = ((char_u **)cctx->ctx_ufunc->uf_lines.ga_data)[cctx->ctx_lnum];