return early linear adaptation zero

[MathisGD]

No description provided.

[Rubilmax]

I'm fine with it!
I would not indent all the code in the else branch though if using early returns (we're indenting twice for no reason)

[QGarchery]

Approving, and the test for it is in #80 here :

morpho-blue-irm/test/SpeedJumpIrmTest.sol

Lines 163 to 178 in 3fbeaf1

	function testRateAfterUtilizationTargetNoPing(uint256 elapsed) public {
	elapsed = bound(elapsed, 0, type(uint48).max);
	Market memory market;
	market.totalSupplyAssets = 1 ether;
	market.totalBorrowAssets = uint128(uint256(TARGET_UTILIZATION));
	assertEq(irm.borrowRate(marketParams, market), uint256(INITIAL_RATE_AT_TARGET));
	assertEq(irm.rateAtTarget(marketParams.id()), INITIAL_RATE_AT_TARGET);
	market.lastUpdate = uint128(block.timestamp);
	vm.warp(block.timestamp + elapsed);
	irm.borrowRate(marketParams, market);
	assertEq(irm.rateAtTarget(marketParams.id()), INITIAL_RATE_AT_TARGET);
	}

[MathisGD]

I'm fine with it! I would not indent all the code in the else branch though if using early returns (we're indenting twice for no reason)

I did it because the code is already like that (for when startBorrowRate==0)