usb/storage: Invert the logic of the IF-statements
usb/storage: Invert the logic of the IF-statements

to prepare write implementation

Signed-off-by: Laurent Vivier <240b731be4efaffb85b5d13af681c07e7ef8ddcb@redhat.com>
Reviewed-by: Thomas Huth <9e65be74847981e55b2564b6266c57d86d3bac05@redhat.com>
Signed-off-by: Alexey Kardashevskiy <ac1fc56530d7d037e1ea666f130daca22d72f964@ozlabs.ru>

qemu/SLOF,aik/SLOF,qemu/SLOF,stefanberger/SLOF-tpm,aik/SLOF,aik/SLOF,stefanberger/SLOF-tpm,stefanberger/SLOF-tpm,qemu/SLOF