style: fix code style

Author: vlsi

plugins/license-gather-plugin/src/main/kotlin/com/github/vlsi/gradle/license/LicenseCompatibilityInterpreter.kt

@@ -74,9 +74,7 @@ internal class LicenseCompatibilityInterpreter(
         resolvedCases[licenseExpression]?.let { return it.asResolved(licenseExpression) }
 
         // Expand the license (e.g. expand OR_LATER into OR ... OR)
-        val e = licenseEquivalence.expand(licenseExpression)
-
-        return when (e) {
+        return when (val e = licenseEquivalence.expand(licenseExpression)) {
             is DisjunctionLicenseExpression ->
                 // A or X => A
                 e.unordered.takeIf { it.isNotEmpty() }?.map { eval(it) }?.reduce { a, b ->

plugins/license-gather-plugin/src/main/kotlin/com/github/vlsi/gradle/license/api/LicenseEquivalence.kt

@@ -55,7 +55,7 @@ class LicenseEquivalence(
             }
         }
         val result = seq.toSet()
-        return if (result.isEmpty()) null else result
+        return result.ifEmpty { null }
     }
 
     fun expand(licenseExpression: LicenseExpression): LicenseExpression {

plugins/license-gather-plugin/src/main/kotlin/com/github/vlsi/gradle/license/api/LicenseExpression.kt

@@ -160,7 +160,7 @@ fun LicenseExpression.weight(): Int =
         is JustLicense -> 1
         is OrLaterLicense -> 2
         is WithException -> license.weight() + 1
-        is ConjunctionLicenseExpression -> licenses.map { it.weight() + 1 }.maxOrNull() ?: 1
-        is DisjunctionLicenseExpression -> licenses.map { it.weight() + 1 }.maxOrNull() ?: 1
+        is ConjunctionLicenseExpression -> licenses.maxOfOrNull { it.weight() + 1 } ?: 1
+        is DisjunctionLicenseExpression -> licenses.maxOfOrNull { it.weight() + 1 } ?: 1
         else -> TODO("Unexpected expression: ${this::class.simpleName}: $this")
     }

plugins/license-gather-plugin/src/main/kotlin/com/github/vlsi/gradle/release/AsfLicenseCategory.kt

@@ -22,11 +22,8 @@ import com.github.vlsi.gradle.license.api.License
 import com.github.vlsi.gradle.license.api.LicenseEquivalence
 import com.github.vlsi.gradle.license.api.LicenseExpression
 import com.github.vlsi.gradle.license.api.LicenseExpressionSet
-import com.github.vlsi.gradle.license.api.LicenseExpressionSetOperation
 import com.github.vlsi.gradle.license.api.SpdxLicense
 import com.github.vlsi.gradle.license.api.SpdxLicenseException
-import com.github.vlsi.gradle.license.api.orLater
-import com.github.vlsi.gradle.license.api.with
 
 /**
  * See https://apache.org/legal/resolved.html