alsa: fix signature of snd_pcm_hw_params_get_rate()

Reference issue: https://github.com/libsdl-org/SDL/issues/13845.

src/audio/alsa/SDL_alsa_audio.c

@@ -62,7 +62,7 @@ static int (*ALSA_snd_pcm_hw_params_set_access)(snd_pcm_t *, snd_pcm_hw_params_t
 static int (*ALSA_snd_pcm_hw_params_set_format)(snd_pcm_t *, snd_pcm_hw_params_t *, snd_pcm_format_t);
 static int (*ALSA_snd_pcm_hw_params_set_channels)(snd_pcm_t *, snd_pcm_hw_params_t *, unsigned int);
 static int (*ALSA_snd_pcm_hw_params_get_channels)(const snd_pcm_hw_params_t *, unsigned int *);
-static int (*ALSA_snd_pcm_hw_params_get_rate)(snd_pcm_hw_params_t *, unsigned int*, int*);
+static int (*ALSA_snd_pcm_hw_params_get_rate)(const snd_pcm_hw_params_t *, unsigned int*, int*);
 static int (*ALSA_snd_pcm_hw_params_set_rate_near)(snd_pcm_t *, snd_pcm_hw_params_t *, unsigned int *, int *);
 static int (*ALSA_snd_pcm_hw_params_set_period_size_near)(snd_pcm_t *, snd_pcm_hw_params_t *, snd_pcm_uframes_t *, int *);
 static int (*ALSA_snd_pcm_hw_params_get_period_size)(const snd_pcm_hw_params_t *, snd_pcm_uframes_t *, int *);