in perp settle fees, dont error, rather return early, this enables blindly concatenating perp settle fees to perp settle pnl (#526)

* in perp settle fees, dont error, rather return early

Signed-off-by: microwavedcola1 <microwavedcola@gmail.com>

* Fixes from review

Signed-off-by: microwavedcola1 <microwavedcola@gmail.com>

---------

Signed-off-by: microwavedcola1 <microwavedcola@gmail.com>

programs/mango-v4/src/instructions/perp_settle_fees.rs

@@ -43,18 +43,17 @@ pub fn perp_settle_fees(ctx: Context<PerpSettleFees>, max_settle_amount: u64) ->
     // Calculate PnL
     let pnl = perp_position.unsettled_pnl(&perp_market, oracle_price)?;
 
-    // Account perp position must have a loss to be able to settle against the fee account
-    require!(pnl.is_negative(), MangoError::ProfitabilityMismatch);
-    require!(
-        perp_market.fees_accrued.is_positive(),
-        MangoError::ProfitabilityMismatch
-    );
-
     let settleable_pnl = perp_position.apply_pnl_settle_limit(&perp_market, pnl);
-    require!(
-        settleable_pnl.is_negative(),
-        MangoError::ProfitabilityMismatch
-    );
+
+    if !settleable_pnl.is_negative() || !perp_market.fees_accrued.is_positive() {
+        msg!(
+            "Not settling: pnl {}, perp_market.fees_accrued {}, settleable_pnl {}",
+            pnl,
+            perp_market.fees_accrued,
+            settleable_pnl
+        );
+        return Ok(());
+    }
 
     // Settle for the maximum possible capped to max_settle_amount
     let settlement = settleable_pnl