git: openjdk/jdk13u-dev: 8273826: Correct Manifest file name and NPE checks

[Yuri Nesterenko]

Changeset: f9b153a1
Author:    Yuri Nesterenko <yan at openjdk.org>
Date:      2022-04-28 06:28:38 +0000
URL:       https://git.openjdk.java.net/jdk13u-dev/commit/f9b153a1f669a49cd240c561580f33830ce899e8

8273826: Correct Manifest file name and NPE checks

Reviewed-by: dcherepanov
Backport-of: 03a8d342b86e720d3cba08d540182b4ab161fba3

! src/java.base/share/classes/java/util/jar/JarFile.java
! src/java.base/share/classes/java/util/jar/JarInputStream.java
! src/java.base/share/classes/java/util/jar/JarVerifier.java
! src/java.base/share/classes/sun/security/util/ManifestEntryVerifier.java
+ test/jdk/sun/security/tools/jarsigner/warnings/LowerCaseManifest.java