fix(guid-partition): initialise the mbr_entry variable

The compiler complains that it may be used unitialised. Give it some
confidence that won't be the case.

Change-Id: I14bddd48e4b205121415025175f157b92a89aa26
Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
1 file changed