Commit 54729fb458 removed some dead code spotted by Coverity
but it had as effect to trigger a gcc warning, which prefers to see all enum in a switch rather than dead code:
pn53x.c: In function 'pn53x_InJumpForDEP':
pn53x.c:2552:5: warning: enumeration value 'NBR_UNDEFINED' not handled in switch [-Wswitch]
pn53x.c:2552:5: warning: enumeration value 'NBR_847' not handled in switch [-Wswitch]
So both switches were merged, which slightly optimizes the code for speed.