Bluetooth: Convert bt_<level> logging functions to return void

No caller or macro uses the return value so make all
the functions return void.
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

include/net/bluetooth/bluetooth.h

@@ -120,9 +120,9 @@ struct bt_voice {
 #define BT_RCVMTU		13
 
 __printf(1, 2)
-int bt_info(const char *fmt, ...);
+void bt_info(const char *fmt, ...);
 __printf(1, 2)
-int bt_err(const char *fmt, ...);
+void bt_err(const char *fmt, ...);
 
 #define BT_INFO(fmt, ...)	bt_info(fmt "\n", ##__VA_ARGS__)
 #define BT_ERR(fmt, ...)	bt_err(fmt "\n", ##__VA_ARGS__)

net/bluetooth/lib.c

@@ -135,40 +135,34 @@ int bt_to_errno(__u16 code)
 }
 EXPORT_SYMBOL(bt_to_errno);
 
-int bt_info(const char *format, ...)
+void bt_info(const char *format, ...)
 {
 	struct va_format vaf;
 	va_list args;
-	int r;
 
 	va_start(args, format);
 
 	vaf.fmt = format;
 	vaf.va = &args;
 
-	r = pr_info("%pV", &vaf);
+	pr_info("%pV", &vaf);
 
 	va_end(args);
-
-	return r;
 }
 EXPORT_SYMBOL(bt_info);
 
-int bt_err(const char *format, ...)
+void bt_err(const char *format, ...)
 {
 	struct va_format vaf;
 	va_list args;
-	int r;
 
 	va_start(args, format);
 
 	vaf.fmt = format;
 	vaf.va = &args;
 
-	r = pr_err("%pV", &vaf);
+	pr_err("%pV", &vaf);
 
 	va_end(args);
-
-	return r;
 }
 EXPORT_SYMBOL(bt_err);