kdbus: Remove unreachable code from kdbus_msg_examine
This fixes an issue pointed out with SVACE warning:
* UNREACHABLE_CODE: This statement in the source code might be unreachable
during program execution.
[unreachable] unreachable at linux-rpi3/ipc/kdbus/message.c:346
[vec_size > vec_size + size (0 > ANY) is always false] vec_size >
vec_size + size (0 > ANY) is always false at linux-rpi3/ipc/kdbus/message.c:345
Change-Id: Ic154b2dbb0740f9e49b68ef273f19cd89e90c200
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>