sensor: fixes program hangs in the apds9960 sample

If an i2c transaction fails the sample will hang the program into
an infinite circle.

This commit will remove the infinite circle and report back the
error code from the i2c transaction.

Change-Id: I38d350a805af6bec43f2fa8d4af6ce4e3cc27662
Coverity-CID: 151991
Coverity-CID: 151992
Signed-off-by: Juan Manuel Cruz <juan.m.cruz.alcaraz@intel.com>