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We need to increment the ucounts reference counter befor security_prepare_creds()
because this function may fail and abort_creds() will try to decrement
this reference.

[   96.465056][ T8641] FAULT_INJECTION: forcing a failure.
[   96.465056][ T8641] name fail_page_alloc, interval 1, probability 0, space 0, times 0
[   96.478453][ T8641] CPU: 1 PID: 8641 Comm: syz-executor668 Not tainted 5.14.0-rc6-syzkaller #0
[   96.487215][ T8641] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   96.497254][ T8641] Call Trace:
[   96.500517][ T8641]  dump_stack_lvl+0x1d3/0x29f
[   96.505758][ T8641]  ? show_regs_print_info+0x12/0x12
[   96.510944][ T8641]  ? log_buf_vmcoreinfo_setup+0x498/0x498
[   96.516652][ T8641]  should_fail+0x384/0x4b0
[   96.521141][ T8641]  prepare_alloc_pages+0x1d1/0x5a0
[   96.526236][ T8641]  __alloc_pages+0x14d/0x5f0
[   96.530808][ T8641]  ? __rmqueue_pcplist+0x2030/0x2030
[   ...