tests: fix check for --graph option in test-log-linerange.t

Previous test about incompatibility of --line-range and --graph options
was problematic because, even without --graph option, the command would
have failed because specified path (dir/baz) did not exist as it got
dropped in previous test statements. New test statements should work
without --graph. This prepares for making --line-range compatible with
--graph option.

tests/test-log-linerange.t

@@ -172,6 +172,9 b' Add some changes with two diff hunks'
   +3
   +4
   
+  $ hg log -f --graph -L foo,5:7 -p
+  abort: graph not supported with line range patterns
+  [255]
 
 With --template.
 
@@ -849,9 +852,3 b' We get an error for removed files.'
   $ hg log -f -L dir/baz,5:7 -p
   abort: cannot follow file not in parent revision: "dir/baz"
   [255]
-
-Graph log does work yet.
-
-  $ hg log -f -L dir/baz,5:7 --graph
-  abort: graph not supported with line range patterns
-  [255]