ALSA: usb-audio: Drop debug.h

The file debug.h contains a simple macro for debug prints, and it's
used only in two places, the format parser and the hw_params rules.
The former actually should print a more informative message instead,
so the only users are the hw_parmas rules.

This patch moves the contents of debug.h into the hw_params rules
local code and remove the unneeded includes.  Also, the debug print in
the format parser is replaced with the information print with more
useful information, and the raw printk() call is replaced with
pr_debug().
Tested-by: Keith Milner <kamilner@superlative.org>
Tested-by: Dylan Robinson <dylan_robinson@motu.com>
Link: https://lore.kernel.org/r/20201123085347.19667-13-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/card.c

@@ -49,7 +49,6 @@
 #include "quirks.h"
 #include "endpoint.h"
 #include "helper.h"
-#include "debug.h"
 #include "pcm.h"
 #include "format.h"
 #include "power.h"

sound/usb/debug.h

-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef __USBAUDIO_DEBUG_H
-#define __USBAUDIO_DEBUG_H
-
-/*
- * h/w constraints
- */
-
-#ifdef HW_CONST_DEBUG
-#define hwc_debug(fmt, args...) printk(KERN_DEBUG fmt, ##args)
-#else
-#define hwc_debug(fmt, args...) do { } while(0)
-#endif
-
-#endif /* __USBAUDIO_DEBUG_H */
-

sound/usb/format.c

@@ -16,7 +16,6 @@
 #include "card.h"
 #include "quirks.h"
 #include "helper.h"
-#include "debug.h"
 #include "clock.h"
 #include "format.h"
 
@@ -227,7 +226,9 @@ static int parse_audio_format_rates_v1(struct snd_usb_audio *chip, struct audiof
 			fp->nr_rates++;
 		}
 		if (!fp->nr_rates) {
-			hwc_debug("All rates were zero. Skipping format!\n");
+			usb_audio_info(chip,
+				       "%u:%d: All rates were zero\n",
+				       fp->iface, fp->altsetting);
 			return -EINVAL;
 		}
 	} else {

sound/usb/pcm.c

@@ -17,7 +17,6 @@
 #include "usbaudio.h"
 #include "card.h"
 #include "quirks.h"
-#include "debug.h"
 #include "endpoint.h"
 #include "helper.h"
 #include "pcm.h"
@@ -1061,6 +1060,16 @@ static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 	return ret;
 }
 
+/*
+ * h/w constraints
+ */
+
+#ifdef HW_CONST_DEBUG
+#define hwc_debug(fmt, args...) pr_debug(fmt, ##args)
+#else
+#define hwc_debug(fmt, args...) do { } while(0)
+#endif
+
 static const struct snd_pcm_hardware snd_usb_hardware =
 {
 	.info =			SNDRV_PCM_INFO_MMAP |