libxl: consolidate casting to xc psr type to a function

In commit 31268fea (libxl: fix passing the type argument to xc_psr_*),
casting to xc psr type was done at each call site.

This patch consolidates casting into a function to avoid casting at each
conversion point. Each call site remains more type safe.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Release-acked-by: Wei Liu <wei.liu2@citrix.com>

tools/libxl/libxl_psr.c

@@ -293,12 +293,18 @@ out:
     return rc;
 }
 
+static inline xc_psr_cat_type libxl__psr_cbm_type_to_libxc_psr_cat_type(
+    libxl_psr_cbm_type type)
+{
+    BUILD_BUG_ON(sizeof(libxl_psr_cbm_type) != sizeof(xc_psr_cat_type));
+    return (xc_psr_cat_type)type;
+}
+
 int libxl_psr_cat_set_cbm(libxl_ctx *ctx, uint32_t domid,
                           libxl_psr_cbm_type type, libxl_bitmap *target_map,
                           uint64_t cbm)
 {
     GC_INIT(ctx);
-    BUILD_BUG_ON(sizeof(libxl_psr_cbm_type) != sizeof(xc_psr_cat_type));
     int rc;
     int socketid, nr_sockets;
 
@@ -309,9 +315,13 @@ int libxl_psr_cat_set_cbm(libxl_ctx *ctx, uint32_t domid,
     }
 
     libxl_for_each_set_bit(socketid, *target_map) {
+        xc_psr_cat_type xc_type;
+
         if (socketid >= nr_sockets)
             break;
-        if (xc_psr_cat_set_domain_data(ctx->xch, domid, (xc_psr_cat_type)type,
+
+        xc_type = libxl__psr_cbm_type_to_libxc_psr_cat_type(type);
+        if (xc_psr_cat_set_domain_data(ctx->xch, domid, xc_type,
                                        socketid, cbm)) {
             libxl__psr_cat_log_err_msg(gc, errno);
             rc = ERROR_FAIL;
@@ -329,8 +339,9 @@ int libxl_psr_cat_get_cbm(libxl_ctx *ctx, uint32_t domid,
 {
     GC_INIT(ctx);
     int rc = 0;
+    xc_psr_cat_type xc_type = libxl__psr_cbm_type_to_libxc_psr_cat_type(type);
 
-    if (xc_psr_cat_get_domain_data(ctx->xch, domid, (xc_psr_cat_type)type,
+    if (xc_psr_cat_get_domain_data(ctx->xch, domid, xc_type,
                                    target, cbm_r)) {
         libxl__psr_cat_log_err_msg(gc, errno);
         rc = ERROR_FAIL;