rsi: Add pr_fmt,__printf, fix format & arg mismatch

Emit a prefix for the rsi_dbg messages.

Fix the format and argument mismatch and add
__printf(2, 3) to try to avoid more.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rsi/rsi_main.h b/drivers/net/wireless/rsi/rsi_main.h
index e97e6ad..2cb73e7 100644
--- a/drivers/net/wireless/rsi/rsi_main.h
+++ b/drivers/net/wireless/rsi/rsi_main.h
@@ -40,7 +40,7 @@
 #define FSM_MAC_INIT_DONE               6
 
 extern u32 rsi_zone_enabled;
-extern void rsi_dbg(u32 zone, const char *fmt, ...);
+extern __printf(2, 3) void rsi_dbg(u32 zone, const char *fmt, ...);
 
 #define RSI_MAX_VIFS                    1
 #define NUM_EDCA_QUEUES                 4