Fix all warnings in TurboJPEG code

Actually use the error code from tjCompress() by logging the errors.

Make sure width is more than zero before filling the pad with the last
pixel data.

libxrdp/xrdp_jpeg_compress.c

@@ -28,6 +28,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <turbojpeg.h>
+#include "log.h"
 
 /*****************************************************************************/
 int APP_CC
@@ -81,18 +82,28 @@ xrdp_jpeg_compress(void *handle, char *in_data, int width, int height,
                 *dst32 = pixel;
                 dst32++;
             }
+            if (width > 0)
+            {
                 for (i = 0; i < e; i++)
                 {
                     *dst32 = pixel;
                     dst32++;
                 }
             }
+        }
         src_buf = (unsigned char *) temp_buf;
     }
     dst_buf = (unsigned char*)(s->p);
     error = tjCompress(tj_han, src_buf, width + e, (width + e) * 4, height,
                        TJPF_XBGR, dst_buf, &cdata_bytes,
                        TJSAMP_420, quality, 0);
+    if (error != 0)
+    {
+        log_message(LOG_LEVEL_ERROR,
+                    "xrdp_jpeg_compress: tjCompress error: %s",
+                    tjGetErrorStr());
+    }
+
     s->p += cdata_bytes;
     g_free(temp_buf);
     return height;
@@ -171,6 +182,13 @@ xrdp_codec_jpeg_compress(void *handle,
                        quality,    /* jpeg quality */
                        0           /* flags */
                        );
+    if (error != 0)
+    {
+        log_message(LOG_LEVEL_ERROR,
+                    "xrdp_codec_jpeg_compress: tjCompress error: %s",
+                    tjGetErrorStr());
+    }
+
     *io_len = lio_len;
     return height;
 }