patch 9.1.0767: A condition is always true in ex_getln.c

Problem:  A cmdlen == 0 condition is always true as ccline.cmdlen == 0
          was already checked above (after v9.1.0766).
Solution: Remove the condition and the variable.
          (zeertzjq)

closes: #15830

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_mapping.vim b/src/testdir/test_mapping.vim
index 122793c..c352531 100644
--- a/src/testdir/test_mapping.vim
+++ b/src/testdir/test_mapping.vim
@@ -89,7 +89,7 @@
         \        .. "!  foo           foobar", execute('abbrev'))
 
   abclear
-   call assert_equal("\n\nNo abbreviation found", execute('abbrev'))
+  call assert_equal("\n\nNo abbreviation found", execute('abbrev'))
 
   %bwipe
 endfunc