tools/power/x86/intel-speed-select: Fix warning for perf_cap.cpu

Initialize perf_cap struct to avoid warning:

  CC      hfi-events.o
In function ‘process_hfi_event’,
    inlined from ‘handle_event’ at hfi-events.c:220:5:
hfi-events.c:184:9: warning: ‘perf_cap.cpu’ may be used
uninitialized [-Wmaybe-uninitialized]
  184 |         process_level_change(perf_cap->cpu);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
hfi-events.c: In function ‘handle_event’:
hfi-events.c:193:25: note: ‘perf_cap.cpu’ was declared here
  193 |         struct perf_cap perf_cap;
      |                         ^~~~~~~~
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Link: https://lore.kernel.org/r/20220511171208.211319-1-srinivas.pandruvada@linux.intel.comSigned-off-by: Hans de Goede <hdegoede@redhat.com>

tools/power/x86/intel-speed-select/hfi-events.c

@@ -190,7 +190,7 @@ static int handle_event(struct nl_msg *n, void *arg)
 	struct genlmsghdr *genlhdr = genlmsg_hdr(nlh);
 	struct nlattr *attrs[THERMAL_GENL_ATTR_MAX + 1];
 	int ret;
-	struct perf_cap perf_cap;
+	struct perf_cap perf_cap = {0};
 
 	ret = genlmsg_parse(nlh, 0, attrs, THERMAL_GENL_ATTR_MAX, NULL);