ensure fallbacks are only used for stale or unconfident oracles

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

@@ -467,7 +467,7 @@ pub fn token_edit(
     let bank = ctx.remaining_accounts.first().unwrap().load_mut::<Bank>()?;
     bank.verify()?;
 
-    emit_stack!(TokenMetaDataLogV2 {
+    emit_stack(TokenMetaDataLogV2 {
         mango_group: ctx.accounts.group.key(),
         mint: mint_info.mint.key(),
         token_index: bank.token_index,

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

@@ -152,7 +152,7 @@ pub fn token_register(
     mint_info.banks[0] = ctx.accounts.bank.key();
     mint_info.vaults[0] = ctx.accounts.vault.key();
 
-    emit_stack!(TokenMetaDataLogV2 {
+    emit_stack(TokenMetaDataLogV2 {
         mango_group: ctx.accounts.group.key(),
         mint: ctx.accounts.mint.key(),
         token_index,

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

@@ -135,7 +135,7 @@ pub fn token_register_trustless(
     mint_info.banks[0] = ctx.accounts.bank.key();
     mint_info.vaults[0] = ctx.accounts.vault.key();
 
-    emit_stack!(TokenMetaDataLogV2 {
+    emit_stack(TokenMetaDataLogV2 {
         mango_group: ctx.accounts.group.key(),
         mint: ctx.accounts.mint.key(),
         token_index,

programs/mango-v4/src/state/bank.rs

@@ -974,12 +974,12 @@ impl Bank {
         staleness_slot: Option<u64>,
     ) -> Result<I80F48> {
         let primary_price = self.oracle_price(oracle_acc, staleness_slot);
-        if primary_price.is_ok() || fallback_oracle_acc_opt.is_none() {
-            primary_price
-        } else {
+        if primary_price.is_oracle_error() && fallback_oracle_acc_opt.is_some() {
             let fallback_oracle_acc = fallback_oracle_acc_opt.unwrap();
             require_keys_eq!(self.fallback_oracle, *fallback_oracle_acc.key());
             self.oracle_price_inner(fallback_oracle_acc, staleness_slot)
+        } else {
+            primary_price
         }
     }