Always check/return errors.

reedsolomon.go

@@ -114,9 +114,19 @@ func New(dataShards, parityShards int) (Encoder, error) {
 	// This will make the top square be the identity matrix, but
 	// preserve the property that any square subset of rows  is
 	// invertible.
-	top, _ := vm.SubMatrix(0, 0, dataShards, dataShards)
-	top, _ = top.Invert()
+	top, err := vm.SubMatrix(0, 0, dataShards, dataShards)
+	if err != nil {
+		return nil, err
+	}
+
+	top, err = top.Invert()
+	if err != nil {
+		return nil, err
+	}
 	r.m, err = vm.Multiply(top)
+	if err != nil {
+		return nil, err
+	}
 
 	r.parity = make([][]byte, parityShards)
 	for i := range r.parity {