sensorhandler: fix type of get_reservation_id()

The implementation of get_reservation_id() is combining two uint8_t, but
currently returns a uint8_t. Return instead a uint16_t to correct this.

Change-Id: I5bbfdd230bcc2bb467b755ac90a39c6bf11167d1
Signed-off-by: Emily Shaffer <emilyshaffer@google.com>
diff --git a/sensorhandler.hpp b/sensorhandler.hpp
index 954a3ed..64cfa0e 100644
--- a/sensorhandler.hpp
+++ b/sensorhandler.hpp
@@ -155,7 +155,7 @@
 namespace request
 {
 
-inline uint8_t get_reservation_id(GetSdrReq* req)
+inline uint16_t get_reservation_id(GetSdrReq* req)
 {
     return (req->reservation_id_lsb + (req->reservation_id_msb << 8));
 };