nvmem: core: return error code instead of NULL from nvmem_device_get

BugLink: https://bugs.launchpad.net/bugs/1853881

[ Upstream commit ca6ac25c ]

nvmem_device_get() should return ERR_PTR() on error or valid pointer
on success, but one of the code path seems to return NULL, so fix it.
Reported-by: Niklas Cassel <niklas.cassel@linaro.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Connor Kuehl <connor.kuehl@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

drivers/nvmem/core.c

@@ -457,7 +457,7 @@ static struct nvmem_device *nvmem_find(const char *name)
 	d = bus_find_device(&nvmem_bus_type, NULL, (void *)name, nvmem_match);
 
 	if (!d)
-		return NULL;
+		return ERR_PTR(-ENOENT);
 
 	return to_nvmem_device(d);
 }