iavf: remove redundant ret variable

stable inclusion
from stable-v5.10.158
commit d389a4c6987708533000130592ddf33bc48b8b0d
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7NTXH

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=d389a4c6987708533000130592ddf33bc48b8b0d



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[ Upstream commit c3fec56e ]

Return value directly instead of taking this in another redundant
variable.

Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Minghao Chi <chi.minghao@zte.com.cn>
Signed-off-by: CGEL ZTE <cgel.zte@gmail.com>
Tested-by: Konrad Jankowski <konrad0.jankowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Stable-dep-of: 227d8d2f ("iavf: Fix error handling in iavf_init_module()")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>