tty: rocket: Fix possible buffer overwrite on register_PCI
If number of isa and pci boards exceed NUM_BOARDS on the path rp_init()->init_PCI()->register_PCI() then buffer overwrite occurs in register_PCI() on assign rcktpt_io_addr[i]. The patch adds check on upper bound for index of registered board in register_PCI. Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Anton Vasilyev <vasilyev@ispras.ru> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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