src/update_handler.c: delete unused variable 'outstream' in img_to_fs_handler
src/update_handler.c: delete unused variable 'outstream' in img_to_fs_handler

Signed-off-by: Rasmus Villemoes <4a950b3c050761f138a737fe02e762ea6e8a2378@prevas.dk>

rauc/rauc,rauc/rauc,jluebbe/rauc,ejoerns/rauc,jluebbe/rauc,ejoerns/rauc,jluebbe/rauc,ejoerns/rauc,rauc/rauc