patch 9.1.0177: Coverity reports dead code

Problem:  Coverity reports dead code.
Solution: Remove the dead code. Also fix a mistake in ml_get_pos_len()
          and update some comments (zeertzjq).

closes: #14189

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_normal.vim b/src/testdir/test_normal.vim
index dc68a15..b180637 100644
--- a/src/testdir/test_normal.vim
+++ b/src/testdir/test_normal.vim
@@ -2364,6 +2364,14 @@
   %d
   call assert_beeps('norm! ~')
 
+  " Test with multiple lines
+  call setline(1, ['AA', 'BBBB', 'CCCCCC', 'DDDDDDDD'])
+  norm! ggguG
+  call assert_equal(['aa', 'bbbb', 'cccccc', 'dddddddd'], getline(1, '$'))
+  norm! GgUgg
+  call assert_equal(['AA', 'BBBB', 'CCCCCC', 'DDDDDDDD'], getline(1, '$'))
+  %d
+
   " Test for changing case across lines using 'whichwrap'
   call setline(1, ['aaaaaa', 'aaaaaa'])
   normal! gg10~