gsid: fix incorrect free space calculation

When a userdata size is not specified on the command line, the default
size is not used when performing the free space sanity check.

Test: manual
Bug: 130775344
Change-Id: I657d8f4a59acb650f795def29fff3dc6e3de27cc
Merged-In: I657d8f4a59acb650f795def29fff3dc6e3de27cc
1 file changed