avcodec/xbmenc: Do not add last comma into output

There is a minor bug in xbm encode which adds a trailing comma at the end
of data. This isn't a big problem, but it would be nicer to be more
technically true to an array of data (by not including the last comma).

This bug fixes the output from something like this (having 4 values):
static unsigned char image_bits[] = { 0x00, 0x11, 0x22, }
to C code that looks like this instead (having 3 values):
static unsigned char image_bits[] = { 0x00, 0x11, 0x22 }
which is the intended results.
Subject: [PATCH 1/3] avcodec/xbmenc: Do not add last comma into output array

xbm outputs c arrays of data.
Including a comma at the end means there is another value to be added.
This bug fix changes something like this:
static unsigned char image_bits[] = { 0x00, 0x11, 0x22, }
to C code like this:
static unsigned char image_bits[] = { 0x00, 0x11, 0x22 }
Signed-off-by: NJoe Da Silva <digital@joescat.com>

libavcodec/xbmenc.c

@@ -27,11 +27,12 @@
 static int xbm_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                             const AVFrame *p, int *got_packet)
 {
-    int i, j, ret, size, linesize;
+    int i, j, commas, ret, size, linesize;
     uint8_t *ptr, *buf;
 
     linesize = (avctx->width + 7) / 8;
-    size     = avctx->height * (linesize * 7 + 2) + 110;
+    commas   = avctx->height * linesize;
+    size     = avctx->height * (linesize * 7 + 2) + 109;
     if ((ret = ff_alloc_packet2(avctx, pkt, size, 0)) < 0)
         return ret;
 
@@ -42,8 +43,11 @@ static int xbm_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
     buf += snprintf(buf, 33, "#define image_height %u\n", avctx->height);
     buf += snprintf(buf, 40, "static unsigned char image_bits[] = {\n");
     for (i = 0; i < avctx->height; i++) {
-        for (j = 0; j < linesize; j++)
-            buf += snprintf(buf, 7, " 0x%02X,", ff_reverse[*ptr++]);
+        for (j = 0; j < linesize; j++) {
+            buf += snprintf(buf, 6, " 0x%02X", ff_reverse[*ptr++]);
+            if (--commas > 0)
+                buf += snprintf(buf, 2, ",");
+        }
         ptr += p->linesize[0] - linesize;
         buf += snprintf(buf, 2, "\n");
     }

tests/ref/lavf/xbm

-0629055fd82366317c651a0af4bb82d7 *tests/data/images/xbm/02.xbm
+83ed197cc88f382d9253365ffef70ec5 *tests/data/images/xbm/02.xbm
 tests/data/images/xbm/%02d.xbm CRC=0xc9a20204
-76411 tests/data/images/xbm/02.xbm
+76410 tests/data/images/xbm/02.xbm