fboota: Cleanup bootimg file to local variable
fboota: Cleanup bootimg file to local variable

Change-Id: I3686c298d71dc7cfdd65b1df989d4ad5d8876ec9
Signed-off-by: Adrian DC <01fb3892f39957945220431e7409156544d2f041@gmail.com>

AdrianDC/android_development_shell_tools,AdrianDC/android_development_shell_tools