ALSA: ymfpci: remove unused snd_ymfpci_readb function

clang with W=1 reports
sound/pci/ymfpci/ymfpci_main.c:34:18: error:
  unused function 'snd_ymfpci_readb' [-Werror,-Wunused-function]
static inline u8 snd_ymfpci_readb(struct snd_ymfpci *chip, u32 offset)
                 ^
This static function is not used, so remove it.
Signed-off-by: Tom Rix <trix@redhat.com>
Link: https://lore.kernel.org/r/20230318132708.1684504-1-trix@redhat.comSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/ymfpci/ymfpci_main.c

@@ -31,11 +31,6 @@
 
 static void snd_ymfpci_irq_wait(struct snd_ymfpci *chip);
 
-static inline u8 snd_ymfpci_readb(struct snd_ymfpci *chip, u32 offset)
-{
-	return readb(chip->reg_area_virt + offset);
-}
-
 static inline void snd_ymfpci_writeb(struct snd_ymfpci *chip, u32 offset, u8 val)
 {
 	writeb(val, chip->reg_area_virt + offset);