bunzip2.tests: replace $? with \$?

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

diff --git a/testsuite/bunzip2.tests b/testsuite/bunzip2.tests
index 7875cd1..734acbb 100755 (executable)
--- a/testsuite/bunzip2.tests
+++ b/testsuite/bunzip2.tests
@@ -504,7 +504,7 @@ prep; >t1; check "$unpack: already exists" "${bb}$unpack t1.$ext t2.$ext; echo \
 
 # From old testsuite
 expected="HELLO\n0\n"
-prep; check "$unpack: stream unpack" "cat t1.$ext | ${bb}$unpack; echo $?"
+prep; check "$unpack: stream unpack" "cat t1.$ext | ${bb}$unpack; echo \$?"
 
 expected="ok\n"
 prep; check "$unpack: delete src" "${bb}$unpack t2.$ext; test ! -f t2.$ext && echo ok"