ALSA: mips: avoid potential uninitialized variable use

MIPS allmodconfig results in this warning:

sound/mips/hal2.c: In function 'hal2_gain_get':
sound/mips/hal2.c:224:35: error: 'r' may be used uninitialized in this function [-Werror=maybe-uninitialized]
sound/mips/hal2.c:223:35: error: 'l' may be used uninitialized in this function [-Werror=maybe-uninitialized]
sound/mips/hal2.c: In function 'hal2_gain_put':
sound/mips/hal2.c:260:13: error: 'new' may be used uninitialized in this function [-Werror=maybe-uninitialized]
sound/mips/hal2.c:260:13: error: 'old' may be used uninitialized in this function [-Werror=maybe-uninitialized]

Returning an error for all unexpected cases shuts up the warning
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/mips/hal2.c

@@ -219,6 +219,8 @@ static int hal2_gain_get(struct snd_kcontrol *kcontrol,
 		l = (tmp >> H2I_C2_L_GAIN_SHIFT) & 15;
 		r = (tmp >> H2I_C2_R_GAIN_SHIFT) & 15;
 		break;
+	default:
+		return -EINVAL;
 	}
 	ucontrol->value.integer.value[0] = l;
 	ucontrol->value.integer.value[1] = r;
@@ -256,6 +258,8 @@ static int hal2_gain_put(struct snd_kcontrol *kcontrol,
 		new |= (r << H2I_C2_R_GAIN_SHIFT);
 		hal2_i_write32(hal2, H2I_ADC_C2, new);
 		break;
+	default:
+		return -EINVAL;
 	}
 	return old != new;
 }