staging: r8188eu: add a check for rtw_cbuf_alloc()
kmalloc() is called by rtw_cbuf_alloc() and it returns pointer of srtuct rtw_cbuf, NULL for allocation failure. So it is better to check the return value of it. Signed-off-by: Xiaoke Wang <xkernel.wang@foxmail.com> Link: https://lore.kernel.org/r/tencent_D95ACC78B93B1CDD14C4E13E4A66FF892008@qq.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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