UPSTREAM: nvmem: sprd: Fix return value of sprd_efuse_probe()

When call function devm_platform_ioremap_resource(), we should use IS_ERR()
to check the return value and return PTR_ERR() if failed.

Fixes: 096030e7f449 ("nvmem: sprd: Add Spreadtrum SoCs eFuse support")
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200722100705.7772-2-srinivas.kandagatla@linaro.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit bcd14bb7a68520bf88e45e91d354e43535624f82)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I6121d3ca4cb636bb4088a3baab6da554984a8dd0