perf intel-pt: pkt-decoder-test: Fix scope of test_data

Make test_data 'static' otherwise it will conflict with any global
variable of the same name.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: https://lore.kernel.org/r/20220124084201.2699795-2-adrian.hunter@intel.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/arch/x86/tests/intel-pt-pkt-decoder-test.c

@@ -17,7 +17,7 @@
  * @new_ctx: expected new packet context
  * @ctx_unchanged: the packet context must not change
  */
-struct test_data {
+static struct test_data {
 	int len;
 	u8 bytes[INTEL_PT_PKT_MAX_SZ];
 	enum intel_pt_pkt_ctx ctx;