parisc: perf: Make cpu_device variable static

Signed-off-by: Helge Deller <deller@gmx.de>

Author: hdeller

arch/parisc/kernel/perf.c

@@ -57,7 +57,7 @@ struct rdr_tbl_ent {
 static int perf_processor_interface __read_mostly = UNKNOWN_INTF;
 static int perf_enabled __read_mostly;
 static DEFINE_SPINLOCK(perf_lock);
-struct parisc_device *cpu_device __read_mostly;
+static struct parisc_device *cpu_device __read_mostly;
 
 /* RDRs to write for PCX-W */
 static const int perf_rdrs_W[] =