Revert "x86: oprofile/op_model_amd.c set return values for op_amd_handle_ibs()"

This reverts commit 21e70878.

Instead Andrew's patch will be applied he posted at the same time.
Signed-off-by: Robert Richter <robert.richter@amd.com>

arch/x86/oprofile/op_model_amd.c

@@ -195,7 +195,7 @@ op_amd_handle_ibs(struct pt_regs * const regs,
 	struct op_entry entry;
 
 	if (!has_ibs)
-		return 0;
+		return 1;
 
 	if (ibs_config.fetch_enabled) {
 		rdmsrl(MSR_AMD64_IBSFETCHCTL, ctl);
@@ -277,10 +277,7 @@ static void op_amd_stop_ibs(void)
 #else
 
 static inline int op_amd_handle_ibs(struct pt_regs * const regs,
-				    struct op_msrs const * const msrs)
-{
-	return 0;
-}
+				    struct op_msrs const * const msrs) { }
 static inline void op_amd_start_ibs(void) { }
 static inline void op_amd_stop_ibs(void) { }