util: fix build without cgroup

Commit 89c509a0 added getters for cgroup block device I/O throttling,
however stub versions of these functions have not matching function
prototypes that result in compilation fail on platforms not supporting
cgroup.

Fix build by correcting prototypes of the stubbed functions.

Pushing under build-breaker rule.

src/util/vircgroup.c

@@ -4427,8 +4427,7 @@ virCgroupSetBlkioDeviceWriteBps(virCgroupPtr group ATTRIBUTE_UNUSED,
 int
 virCgroupGetBlkioDeviceWeight(virCgroupPtr group ATTRIBUTE_UNUSED,
                               const char *path ATTRIBUTE_UNUSED,
-                              const char *dev_str ATTRIBUTE_UNUSED,
-                              unsigned int weight ATTRIBUTE_UNUSED)
+                              unsigned int *weight ATTRIBUTE_UNUSED)
 {
     virReportSystemError(ENOSYS, "%s",
                          _("Control groups not supported on this platform"));
@@ -4438,8 +4437,7 @@ virCgroupGetBlkioDeviceWeight(virCgroupPtr group ATTRIBUTE_UNUSED,
 int
 virCgroupGetBlkioDeviceReadIops(virCgroupPtr group ATTRIBUTE_UNUSED,
                                 const char *path ATTRIBUTE_UNUSED,
-                                const char *dev_str ATTRIBUTE_UNUSED,
-                                unsigned int riops ATTRIBUTE_UNUSED)
+                                unsigned int *riops ATTRIBUTE_UNUSED)
 {
     virReportSystemError(ENOSYS, "%s",
                          _("Control groups not supported on this platform"));
@@ -4449,8 +4447,7 @@ virCgroupGetBlkioDeviceReadIops(virCgroupPtr group ATTRIBUTE_UNUSED,
 int
 virCgroupGetBlkioDeviceWriteIops(virCgroupPtr group ATTRIBUTE_UNUSED,
                                  const char *path ATTRIBUTE_UNUSED,
-                                 const char *dev_str ATTRIBUTE_UNUSED,
-                                 unsigned int wiops ATTRIBUTE_UNUSED)
+                                 unsigned int *wiops ATTRIBUTE_UNUSED)
 {
     virReportSystemError(ENOSYS, "%s",
                          _("Control groups not supported on this platform"));
@@ -4460,8 +4457,7 @@ virCgroupGetBlkioDeviceWriteIops(virCgroupPtr group ATTRIBUTE_UNUSED,
 int
 virCgroupGetBlkioDeviceReadBps(virCgroupPtr group ATTRIBUTE_UNUSED,
                                const char *path ATTRIBUTE_UNUSED,
-                               const char *dev_str ATTRIBUTE_UNUSED,
-                               unsigned long long rbps ATTRIBUTE_UNUSED)
+                               unsigned long long *rbps ATTRIBUTE_UNUSED)
 {
     virReportSystemError(ENOSYS, "%s",
                          _("Control groups not supported on this platform"));
@@ -4471,8 +4467,7 @@ virCgroupGetBlkioDeviceReadBps(virCgroupPtr group ATTRIBUTE_UNUSED,
 int
 virCgroupGetBlkioDeviceWriteBps(virCgroupPtr group ATTRIBUTE_UNUSED,
                                 const char *path ATTRIBUTE_UNUSED,
-                                const char *dev_str ATTRIBUTE_UNUSED,
-                                unsigned long long wbps ATTRIBUTE_UNUSED)
+                                unsigned long long *wbps ATTRIBUTE_UNUSED)
 {
     virReportSystemError(ENOSYS, "%s",
                          _("Control groups not supported on this platform"));