ALSA: rawmidi: Replace with __packed attribute

Replace the old __attribute__((packed)) with the new __packed.
Only cleanup, no functional changes.

Link: https://lore.kernel.org/r/20231025132314.5878-4-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/core/rawmidi_compat.c

@@ -15,7 +15,7 @@ struct snd_rawmidi_params32 {
 	unsigned int no_active_sensing; /* avoid bit-field */
 	unsigned int mode;
 	unsigned char reserved[12];
-} __attribute__((packed));
+} __packed;
 
 static int snd_rawmidi_ioctl_params_compat(struct snd_rawmidi_file *rfile,
 					   struct snd_rawmidi_params32 __user *src)
@@ -51,7 +51,7 @@ struct compat_snd_rawmidi_status64 {
 	u32 avail;
 	u32 xruns;
 	unsigned char reserved[16];
-} __attribute__((packed));
+} __packed;
 
 static int snd_rawmidi_ioctl_status_compat64(struct snd_rawmidi_file *rfile,
 					     struct compat_snd_rawmidi_status64 __user *src)