pcmcia: db1xxx_ss: Fix fall-through warning for Clang

Fix the following fallthrough warning:

drivers/pcmcia/db1xxx_ss.c:359:2: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
           case 3:
           ^
   drivers/pcmcia/db1xxx_ss.c:359:2: note: insert 'break;' to avoid fall-through
           case 3:
           ^
           break;

This helps with the ongoing efforts to globally enable
-Wimplicit-fallthrough for Clang.

Link: KSPP#115
Link: https://lore.kernel.org/linux-mm/[email protected]/
Reported-by: kernel test robot <[email protected]>
Signed-off-by: Gustavo A. R. Silva <[email protected]>

Author: GustavoARSilva

drivers/pcmcia/db1xxx_ss.c

@@ -356,6 +356,7 @@ static int db1x_pcmcia_get_status(struct pcmcia_socket *skt,
 	case 0:
 	case 2:
 		status |= SS_3VCARD;	/* 3V card */
+		break;
 	case 3:
 		break;			/* 5V card: set nothing */
 	default: