Correct the test on RNG device presence,when ret is equal to 0,
before to call dm_rng_read function.
Without this patch the RNG device is not used when present (when ret == 0)
or a data abort occurs in dm_rng_read when CONFIG_DM_RNG is activated but
the RNG device is not present in device tree (ret != 0 and devp = NULL).
[backport of commit 70a9f4d25b ("lib: uuid: fix the test on RNG device presence")]
Fixes: 92fdad28cf ("lib: uuid: use RNG device if present")
CC: Matthias Brugger <mbrugger@suse.com>
CC: Torsten Duwe <duwe@suse.de>
Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Change-Id: I98a420a5666428a3c4737db51d3f9c31d64c66b5
205d9b5c68