net: stmmac: Check stmmac_hw_setup() in stmmac_resume()

net: stmmac: Check stmmac_hw_setup() in stmmac_resume()

stmmac_hw_setup() may return 0 on success and an appropriate negative
integer as defined in errno.h file on failure, just check it and then
return early if failed in stmmac_resume().

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Reviewed-by: Huacai Chen <chenhuacai@loongson.cn>
Link: https://patch.msgid.link/20250811073506.27513-2-yangtiezhu@loongson.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>