ulti: invert the order of parameters of ulti_decode_frame()

This is the order that the caller uses in the rest of the file.
Variables are modified to reflect the order above too and their
initialization is merged with their declarationt. No behavioral
change.

Bug-Id: CID 732286

libavcodec/ulti.c

@@ -384,12 +384,11 @@ static int ulti_decode_frame(AVCodecContext *avctx,
                             Y[3] = bytestream2_get_byteu(&s->gb) & 0x3F;
                             ulti_grad(s->frame, tx, ty, Y, chroma, angle); //draw block
                         } else { // some patterns
-                            int f0, f1;
-                            f0 = bytestream2_get_byteu(&s->gb);
-                            f1 = tmp;
+                            int f0 = tmp;
+                            int f1 = bytestream2_get_byteu(&s->gb);
                             Y[0] = bytestream2_get_byteu(&s->gb) & 0x3F;
                             Y[1] = bytestream2_get_byteu(&s->gb) & 0x3F;
-                            ulti_pattern(s->frame, tx, ty, f1, f0, Y[0], Y[1], chroma);
+                            ulti_pattern(s->frame, tx, ty, f0, f1, Y[0], Y[1], chroma);
                         }
                     }
                     break;