Merge "simpleperf: improve error msg for output file." am: d3eb408a6a am: fee8f1e9a8 am: 4c2ec61ecf

Original change: https://android-review.googlesource.com/c/platform/system/extras/+/1697654

Change-Id: I2c9391fd0314f5b98e4aeea1c11204556233e024