[PATCH] gstreamer-encoder: fix compiler warning

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this warning is failing my build, I assume it comes from a new version
of the compiler catching the useless call to abs().

---

> error: taking the absolute value of unsigned type 'uint64_t'
> {aka 'long unsigned int'} has no effect [-Werror=absolute-value]
---
 server/gstreamer-encoder.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/server/gstreamer-encoder.c b/server/gstreamer-encoder.c
index 6416b688..dbd4b11d 100644
--- a/server/gstreamer-encoder.c
+++ b/server/gstreamer-encoder.c
@@ -515,7 +515,7 @@ static void set_video_bit_rate(SpiceGstEncoder *encoder, uint64_t bit_rate)
         encoder->video_bit_rate = bit_rate;
         set_gstenc_bitrate(encoder);

-    } else  if (abs(bit_rate - encoder->video_bit_rate) > encoder->video_bit_rate * SPICE_GST_VIDEO_BITRATE_MARGIN) {
+    } else  if ((bit_rate - encoder->video_bit_rate) > encoder->video_bit_rate * SPICE_GST_VIDEO_BITRATE_MARGIN) {
         encoder->video_bit_rate = bit_rate;
         set_pipeline_changes(encoder, SPICE_GST_VIDEO_PIPELINE_BITRATE);
     }
--
2.21.0
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