cosmetics: fix indentation after r15321

Originally committed as revision 15332 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/pnm.c

@@ -135,9 +135,9 @@ int ff_pnm_decode_header(AVCodecContext *avctx, PNMContext * const s){
         s->maxval = atoi(buf1);
         if (s->maxval >= 256) {
             if (avctx->pix_fmt == PIX_FMT_GRAY8) {
-            avctx->pix_fmt = PIX_FMT_GRAY16BE;
-            if (s->maxval != 65535)
-                avctx->pix_fmt = PIX_FMT_GRAY16;
+                avctx->pix_fmt = PIX_FMT_GRAY16BE;
+                if (s->maxval != 65535)
+                    avctx->pix_fmt = PIX_FMT_GRAY16;
             } else {
                 av_log(avctx, AV_LOG_ERROR, "16-bit components are only supported for grayscale\n");
                 avctx->pix_fmt = PIX_FMT_NONE;