testsuite: fix bunzip2.tests expectations

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/testsuite/bunzip2.tests b/testsuite/bunzip2.tests
index edb3327..69e34df 100755
--- a/testsuite/bunzip2.tests
+++ b/testsuite/bunzip2.tests
@@ -562,7 +562,7 @@
     fi
 
     errout="`${bb}bunzip2 <bz2_issue_12.bz2 2>&1 >/dev/null`"
-    if test x"$errout:$?" = x"bunzip2: bunzip error -3:1"; then
+    if test x"$errout:$?" = x"bunzip2: bunzip error -5:1"; then
 	echo "PASS: $unpack: bz2_issue_12.bz2 corrupted example"
     else
 	echo "FAIL: $unpack: bz2_issue_12.bz2 corrupted example"