usb: host: ehci-dbg: replace sizeof operand

This patch fixes a coding style issue reported by checkpatch concerning
to usage of sizeof operand as a variable instead the type.

Signed-off-by: Geyslan G. Bem <geyslan@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/host/ehci-dbg.c b/drivers/usb/host/ehci-dbg.c
index 37dac75..22e6d4c 100644
--- a/drivers/usb/host/ehci-dbg.c
+++ b/drivers/usb/host/ehci-dbg.c
@@ -982,7 +982,7 @@
 {
 	struct debug_buffer *buf;
 
-	buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
+	buf = kzalloc(sizeof(*buf), GFP_KERNEL);
 
 	if (buf) {
 		buf->bus = bus;