ALSA: es18xx: Remove the unneeded result variable

Return the value inb() directly instead of storing it in another redundant
variable.

Reported-by: Zeal Robot <[e-mail]>
Signed-off-by: ye xingchen <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Takashi Iwai <[e-mail]>

sound/isa/es18xx.c

···
 
 static int snd_es18xx_config_read(struct snd_es18xx *chip, unsigned char reg)
 {
-	int data;
-
 	outb(reg, chip->ctrl_port);
-	data = inb(chip->ctrl_port + 1);
-	return data;
+	return inb(chip->ctrl_port + 1);
 }
 
 static void snd_es18xx_config_write(struct snd_es18xx *chip,