codec_pref: fix missing breaks in switch-case statement

In function test_codec_support_bts() the switch case statement lacks
break; statements for some cases. This may lead into messed up codec
decisions.

- Add missing break statements

Change-Id: Ib5400a0a0a8a39fa714bd087df345160bed5cc61

src/osmo-bsc/codec_pref.c

@@ -148,15 +148,19 @@ static bool test_codec_support_bts(const struct bts_codec_conf *bts_codec, uint8
 	case GSM0808_PERM_FR2:
 		if (bts_codec->efr)
 			return true;
+		break;
 	case GSM0808_PERM_FR3:
 		if (bts_codec->amr)
 			return true;
+		break;
 	case GSM0808_PERM_HR1:
 		if (bts_codec->hr)
 			return true;
+		break;
 	case GSM0808_PERM_HR3:
 		if (bts_codec->amr)
 			return true;
+		break;
 	default:
 		return false;
 	}