sbcenc: Add missing error check for unsupported sample rates
diff --git a/src/sbcenc.c b/src/sbcenc.c
index dabdff4..2a4c240 100644
--- a/src/sbcenc.c
+++ b/src/sbcenc.c
@@ -105,6 +105,10 @@
 		case 48000:
 			sbc.frequency = SBC_FREQ_48000;
 			break;
+		default:
+			fprintf(stderr, "Unsupported sample rate %ukHz\n",
+					BE_INT(au_hdr.sample_rate));
+			goto done;
 		}
 
 		srate = BE_INT(au_hdr.sample_rate);