fix parse meminfo error am: 278ac87b88 am: 9a53ada9d7 am: 6117c24f29 am: b6579a567e

Original change: https://android-review.googlesource.com/c/platform/test/vts-testcase/kernel/+/1419908

Change-Id: I51b5fde64d7d54bbaa6eac263e9de7c4d1589d27