Staging: echo: remove typedefs

Remove typedefs in drivers/staging/echo

Signed-off by: J.R. Mauro <jrm8005@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/staging/echo/echo.h b/drivers/staging/echo/echo.h
index 9fb9543..34fb816 100644
--- a/drivers/staging/echo/echo.h
+++ b/drivers/staging/echo/echo.h
@@ -149,8 +149,8 @@
 	int Lbgn, Lbgn_acc, Lbgn_upper, Lbgn_upper_acc;
 
 	/* foreground and background filter states */
-	fir16_state_t fir_state;
-	fir16_state_t fir_state_bg;
+	struct fir16_state_t fir_state;
+	struct fir16_state_t fir_state_bg;
 	int16_t *fir_taps16[2];
 
 	/* DC blocking filter states */