staging/lustre: use __printf(...) instead of __attribute__(format(__printf, ...))

Replace uses of __attribute__(format(__printf,...)) by __printf(...), as suggested by checkpatch.
Signed-off-by: Mario J. Rugiero <mrugiero@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/include/linux/libcfs/libcfs_debug.h

@@ -244,12 +244,12 @@ do {									\
 
 int libcfs_debug_msg(struct libcfs_debug_msg_data *msgdata,
 			    const char *format1, ...)
-	__attribute__ ((format (printf, 2, 3)));
+	__printf(2, 3);
 
 int libcfs_debug_vmsg2(struct libcfs_debug_msg_data *msgdata,
 			      const char *format1,
 			      va_list args, const char *format2, ...)
-	__attribute__ ((format (printf, 4, 5)));
+	__printf(4, 5);
 
 /* other external symbols that tracefile provides: */
 int cfs_trace_copyin_string(char *knl_buffer, int knl_buffer_nob,

drivers/staging/lustre/lustre/include/lu_object.h

@@ -192,7 +192,7 @@ struct lu_object_conf {
  */
 typedef int (*lu_printer_t)(const struct lu_env *env,
 			    void *cookie, const char *format, ...)
-	__attribute__ ((format (printf, 3, 4)));
+	__printf(3, 4);
 
 /**
  * Operations specific for particular lu_object.

drivers/staging/lustre/lustre/include/lustre_dlm.h

@@ -1075,7 +1075,7 @@ extern char *ldlm_it2str(int it);
 void _ldlm_lock_debug(struct ldlm_lock *lock,
 		      struct libcfs_debug_msg_data *data,
 		      const char *fmt, ...)
-	__attribute__ ((format (printf, 3, 4)));
+	__printf(3, 4);
 
 /**
  * Rate-limited version of lock printing function.

drivers/staging/lustre/lustre/include/lustre_net.h

@@ -1673,7 +1673,7 @@ ptlrpc_rqphase2str(struct ptlrpc_request *req)
 
 void _debug_req(struct ptlrpc_request *req,
 		struct libcfs_debug_msg_data *data, const char *fmt, ...)
-	__attribute__ ((format (printf, 3, 4)));
+	__printf(3, 4);
 
 /**
  * Helper that decides if we need to print request according to current debug