[commissioner] make simple getter methods inline (#4207)

src/core/meshcop/commissioner.cpp

@@ -374,11 +374,6 @@ exit:
     return error;
 }
 
-const char *Commissioner::GetProvisioningUrl(void) const
-{
-    return mProvisioningUrl;
-}
-
 otError Commissioner::SetProvisioningUrl(const char *aProvisioningUrl)
 {
     otError error = OT_ERROR_NONE;
@@ -401,16 +396,6 @@ exit:
     return error;
 }
 
-uint16_t Commissioner::GetSessionId(void) const
-{
-    return mSessionId;
-}
-
-otCommissionerState Commissioner::GetState(void) const
-{
-    return mState;
-}
-
 void Commissioner::HandleTimer(Timer &aTimer)
 {
     aTimer.GetOwner<Commissioner>().HandleTimer();

src/core/meshcop/commissioner.hpp

@@ -140,7 +140,7 @@ public:
      * @returns A pointer to char buffer containing the URL string.
      *
      */
-    const char *GetProvisioningUrl(void) const;
+    const char *GetProvisioningUrl(void) const { return mProvisioningUrl; }
 
     /**
      * This method sets the Provisioning URL.
@@ -159,7 +159,7 @@ public:
      * @returns The Commissioner Session ID.
      *
      */
-    uint16_t GetSessionId(void) const;
+    uint16_t GetSessionId(void) const { return mSessionId; }
 
     /**
      * This method indicates whether or not the Commissioner role is active.
@@ -179,7 +179,7 @@ public:
      * @retval OT_COMMISSIONER_STATE_ACTIVE    Commissioner enabled.
      *
      */
-    otCommissionerState GetState(void) const;
+    otCommissionerState GetState(void) const { return mState; }
 
     /**
      * This method sends MGMT_COMMISSIONER_GET.