Fix bogus tests on rev-list output.

These tests seem to mean checking the output with expected
result, but was not doing its handrolled test helper function.

Also fix the guard to workaround wc output that have whitespace
padding, which was broken but not exposed because the test was
not testing it ;-).

Signed-off-by: Junio C Hamano <junkio@cox.net>

t/t6001-rev-list-merge-order.sh

@@ -110,7 +110,7 @@ save_tag g4 unique_commit g6 tree -p g3 -p h2
 
 git-update-ref HEAD $(tag l5)
 
-test_expect_success 'rev-list has correct number of entries' 'git-rev-list HEAD | wc -l | tr -s " "' <<EOF
+test_output_expect_success 'rev-list has correct number of entries' 'git-rev-list HEAD | wc -l | tr -d \" \"' <<EOF
 19
 EOF
 

t/t6003-rev-list-topo-order.sh

@@ -79,7 +79,7 @@ save_tag g4 unique_commit g6 tree -p g3 -p h2
 
 git-update-ref HEAD $(tag l5)
 
-test_expect_success 'rev-list has correct number of entries' 'git-rev-list HEAD | wc -l | tr -s " "' <<EOF
+test_output_expect_success 'rev-list has correct number of entries' 'git-rev-list HEAD | wc -l | tr -d \" \"' <<EOF
 19
 EOF