cosa: Add missing kfree in error path of cosa_write
If memory allocation for 'kbuf' succeed, cosa_write() doesn't have a corresponding kfree() in exception handling. Thus add kfree() for this function implementation. Fixes: 1da177e4 ("Linux-2.6.12-rc2") Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Wang Hai <wanghai38@huawei.com> Acked-by: Jan "Yenya" Kasprzak <kas@fi.muni.cz> Link: https://lore.kernel.org/r/20201110144614.43194-1-wanghai38@huawei.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>
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