davinci oss: ifdef enable_adc(), because it is not used.

sound/oss/davinci-audio-aic32.c

@@ -323,6 +323,7 @@ void aic32_show_registers(void)
 	printk(KERN_INFO "Fsref = (MCLK * %d.%d * R)/(2048 * %d);\n", j, d, p);
 }
 
+#if 0
 static void enable_adc(void)
 {
 	audio_aic32_write(LINE1L_TO_LEFT_ADC_CTRL_REG,
@@ -330,6 +331,7 @@ static void enable_adc(void)
 	audio_aic32_write(LINE1R_TO_RIGHT_ADC_CTRL_REG,
 				LINE1R_NOT_CONNECT | RIGHT_ADC_POWER_UP);
 }
+#endif
 
 /* enable ADC and enable line1 input*/
 static void enable_line1_input(void)