display: Fix warnings

Treat warnings as errors again

Change-Id: Ibd7f484d31ad420b85e82fd5183d70bf7dce4bfa
diff --git a/libcopybit/software_converter.cpp b/libcopybit/software_converter.cpp
index 9ea8767..e5c03b5 100644
--- a/libcopybit/software_converter.cpp
+++ b/libcopybit/software_converter.cpp
@@ -213,7 +213,7 @@
             return COPYBIT_FAILURE;
     }
 
-    ret = copy_source_to_destination(hnd->base, dst_hnd->base, info);
+    ret = copy_source_to_destination((uintptr_t) hnd->base, (uintptr_t) dst_hnd->base, info);
     return ret;
 }
 
@@ -258,6 +258,6 @@
             return -1;
     }
 
-    ret = copy_source_to_destination(hnd->base, dst_hnd->base, info);
+    ret = copy_source_to_destination((uintptr_t) hnd->base, (uintptr_t) dst_hnd->base, info);
     return ret;
 }