adpcmenc: ensure calls to adpcm_ima_compress_sample() are in the right order

Should fix fate-acodec-adpcm-ima_wav with several compilers.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/adpcmenc.c

@@ -538,8 +538,9 @@ static int adpcm_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
                     ADPCMChannelStatus *status = &c->status[ch];
                     const int16_t *smp = &samples_p[ch][1 + i * 8];
                     for (j = 0; j < 8; j += 2) {
-                        *dst++ = adpcm_ima_compress_sample(status, smp[j    ]) |
-                                (adpcm_ima_compress_sample(status, smp[j + 1]) << 4);
+                        uint8_t v =  adpcm_ima_compress_sample(status, smp[j    ]);
+                        v        |= (adpcm_ima_compress_sample(status, smp[j + 1]) << 4);
+                        *dst++ = v;
                     }
                 }
             }