ALSA: hda: Return true,false for return type bool

Fix the following coccicheck warning:

include/sound/hdaudio.h:210:73-74: WARNING: return of 0/1 in function
'snd_hdac_is_in_pm' with return type bool
include/sound/hdaudio.h:211:76-77: WARNING: return of 0/1 in function
'snd_hdac_is_power_on' with return type bool
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Link: https://lore.kernel.org/r/20200506061716.19209-1-yanaijie@huawei.comSigned-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/hdaudio.h

@@ -207,8 +207,8 @@ static inline int snd_hdac_power_down_pm(struct hdac_device *codec) { return 0;
 static inline int snd_hdac_keep_power_up(struct hdac_device *codec) { return 0; }
 static inline void snd_hdac_enter_pm(struct hdac_device *codec) {}
 static inline void snd_hdac_leave_pm(struct hdac_device *codec) {}
-static inline bool snd_hdac_is_in_pm(struct hdac_device *codec) { return 0; }
-static inline bool snd_hdac_is_power_on(struct hdac_device *codec) { return 1; }
+static inline bool snd_hdac_is_in_pm(struct hdac_device *codec) { return false; }
+static inline bool snd_hdac_is_power_on(struct hdac_device *codec) { return true; }
 #endif
 
 /*