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	Don't accept an empty string for $ALSA_CONFIG_PATH
The variable $ALSA_CONFIG_PATH specifies the config path, but the current code accepts the empty string and results in a mysterious error because no config file is found. This patch fixes the check of the variable and takes the default value if the string is empty. Signed-off-by: Takashi Iwai <tiwai@suse.de>
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					@ -2962,7 +2962,7 @@ int snd_config_update_r(snd_config_t **_top, snd_config_update_t **_update, cons
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	configs = cfgs;
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						configs = cfgs;
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	if (!configs) {
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						if (!configs) {
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		configs = getenv(ALSA_CONFIG_PATH_VAR);
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							configs = getenv(ALSA_CONFIG_PATH_VAR);
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		if (!configs)
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							if (!configs || !*configs)
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			configs = ALSA_CONFIG_PATH_DEFAULT;
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								configs = ALSA_CONFIG_PATH_DEFAULT;
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	}
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						}
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	for (k = 0, c = configs; (l = strcspn(c, ": ")) > 0; ) {
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						for (k = 0, c = configs; (l = strcspn(c, ": ")) > 0; ) {
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