wimax/i2400m: fix oops when the TX FIFO fills up due to a missing check
When the TX FIFO filled up and i2400m_tx_new() failed to allocate a
new TX message header, a missing check for said condition was causing a
kernel oops when trying to dereference a NULL i2400m->tx_msg pointer.
Found and diagnosed by Cindy H. Kao.
Signed-off-by: NInaky Perez-Gonzalez <inaky@linux.intel.com>
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