Fix pointer sign warnings in JPEG compression code

libxrdp/xrdp_jpeg_compress.c

@@ -213,7 +213,7 @@ xrdp_jpeg_deinit(void *handle)
 
 struct mydata_comp
 {
-    char *cb;
+    JOCTET *cb;
     int cb_bytes;
     int total_done;
     int overwrite;
@@ -265,8 +265,8 @@ my_term_destination(j_compress_ptr cinfo)
 
 /*****************************************************************************/
 static int APP_CC
-jp_do_compress(char *data, int width, int height, int bpp, int quality,
-               char *comp_data, int *comp_data_bytes)
+jp_do_compress(JOCTET *data, int width, int height, int bpp, int quality,
+               JOCTET *comp_data, int *comp_data_bytes)
 {
     struct jpeg_compress_struct cinfo;
     struct jpeg_error_mgr jerr;
@@ -336,9 +336,8 @@ jpeg_compress(char *in_data, int width, int height,
               struct stream *s, struct stream *temp_s, int bpp,
               int byte_limit, int e, int quality)
 {
-    char *data;
+    JOCTET *data;
     tui32 *src32;
-    tui16 *src16;
     tui8 *dst8;
     tui32 pixel;
     int red;
@@ -348,7 +347,7 @@ jpeg_compress(char *in_data, int width, int height,
     int i;
     int cdata_bytes;
 
-    data = temp_s->data;
+    data = (JOCTET *) temp_s->data;
     dst8 = data;
 
     if (bpp == 24)
@@ -380,7 +379,8 @@ jpeg_compress(char *in_data, int width, int height,
     }
 
     cdata_bytes = byte_limit;
-    jp_do_compress(data, width + e, height, 24, quality, s->p, &cdata_bytes);
+    jp_do_compress(data, width + e, height, 24, quality, (JOCTET *) s->p,
+                   &cdata_bytes);
     s->p += cdata_bytes;
     return cdata_bytes;
 }