x86/msr: Use u64 in rdmsrl_safe() and paravirt_read_pmc()

The paravirt_read_pmc() result is in fact only loaded into an u64 variable.

Signed-off-by: Ingo Molnar <[e-mail]>
Acked-by: Peter Zijlstra (Intel) <[e-mail]>
Cc: Juergen Gross <[e-mail]>
Cc: H. Peter Anvin <[e-mail]>
Cc: Dave Hansen <[e-mail]>
Cc: Xin Li <[e-mail]>
Cc: Linus Torvalds <[e-mail]>

arch/x86/include/asm/paravirt.h

···
 	_err;						\
 })
 
-static inline int rdmsrl_safe(unsigned msr, unsigned long long *p)
+static inline int rdmsrl_safe(unsigned msr, u64 *p)
 {
 	int err;
 
···
 	return err;
 }
 
-static inline unsigned long long paravirt_read_pmc(int counter)
+static inline u64 paravirt_read_pmc(int counter)
 {
 	return PVOP_CALL1(u64, cpu.read_pmc, counter);
 }