fix: remove redundant decimals checks from pyth price feed

Author: Van0k

contracts/oracles/updatable/PythPriceFeed.sol

@@ -30,9 +30,6 @@ interface IPythPriceFeedExceptions {
     ///         the payload's internal timestamp
     error IncorrectExpectedPublishTimestamp();
 
-    /// @notice Thrown when the decimals returned by Pyth are outside sane boundaries
-    error IncorrectPriceDecimals();
-
     /// @notice Thrown when a retrieved price's publish time is too far ahead in the future
     error PriceTimestampTooFarAhead();
 
@@ -112,7 +109,6 @@ contract PythPriceFeed is IUpdatablePriceFeed, IPythPriceFeedExceptions {
         if (price == 0) revert IncorrectPriceException();
 
         if (priceData.expo != -8) {
-            if (priceData.expo > 0 || priceData.expo < -255) revert IncorrectPriceDecimals();
             int256 pythDecimals = int256(uint256(10) ** uint32(-priceData.expo));
             price = price * DECIMALS / pythDecimals;
         }

contracts/test/unit/updatable/PythPriceFeed.unit.t.sol

@@ -131,15 +131,5 @@ contract PythPriceFeedUnitTest is TestHelper, IPythPriceFeedExceptions {
         (, price,,,) = pf.latestRoundData();
 
         assertEq(price, 100 * 10 ** 8, "Incorrect price when pyth decimals are 0");
-
-        pyth.setPriceData(bytes32(uint256(1)), 100, 0, 2, block.timestamp);
-
-        vm.expectRevert(IncorrectPriceDecimals.selector);
-        pf.latestRoundData();
-
-        pyth.setPriceData(bytes32(uint256(1)), 100, 0, -257, block.timestamp);
-
-        vm.expectRevert(IncorrectPriceDecimals.selector);
-        pf.latestRoundData();
     }
 }