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

op_amd_handle_ibs() should return 0 when IBS is not present or not defined.

Fix compilation warning:
 CC [M]  arch/x86/oprofile/op_model_amd.o
 arch/x86/oprofile/op_model_amd.c: In function ‘op_amd_handle_ibs’:
 arch/x86/oprofile/op_model_amd.c:217: warning: no return statement in function returning non-void

Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
Signed-off-by: Robert Richter <robert.richter@amd.com>

arch/x86/oprofile/op_model_amd.c

@@ -132,7 +132,7 @@ op_amd_handle_ibs(struct pt_regs * const regs,
 	struct op_entry entry;
 
 	if (!has_ibs)
-		return 1;
+		return 0;
 
 	if (ibs_config.fetch_enabled) {
 		rdmsrl(MSR_AMD64_IBSFETCHCTL, ctl);
@@ -214,7 +214,10 @@ 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) { }
+				    struct op_msrs const * const msrs)
+{
+	return 0;
+}
 static inline void op_amd_start_ibs(void) { }
 static inline void op_amd_stop_ibs(void) { }