adbsiderom: Properly fail and present help with device unknown
adbsiderom: Properly fail and present help with device unknown

Change-Id: I1c90decaaa205a34309209f5612a7e4c98b6a28e
Signed-off-by: Adrian DC <01fb3892f39957945220431e7409156544d2f041@gmail.com>

AdrianDC/android_development_shell_tools,AdrianDC/android_development_shell_tools