ALSA: ctxfi: ct20k1reg: Fix typo in include guard

Signed-off-by: NRasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/pci/ctxfi/ct20k1reg.h

@@ -7,7 +7,7 @@
  */
 
 #ifndef CT20K1REG_H
-#define CT20k1REG_H
+#define CT20K1REG_H
 
 /* 20k1 registers */
 #define 	DSPXRAM_START 			0x000000
@@ -632,5 +632,3 @@
 #define I2SD_R    0x19L
 
 #endif /* CT20K1REG_H */
-
-