Remove -Xep:EqualsNull:WARN am: 7ef30d4799 am: b410698cf0 am: c62602cb8f

Original change: https://android-review.googlesource.com/c/platform/external/error_prone/+/1995752

Change-Id: I25e416e8949e5e48f271038d5bb35ab2b6848a56
diff --git a/soong/error_prone.go b/soong/error_prone.go
index abaea85..b2ba96d 100644
--- a/soong/error_prone.go
+++ b/soong/error_prone.go
@@ -127,7 +127,6 @@
 		"-Xep:DurationFrom:WARN",
 		"-Xep:DurationTemporalUnit:WARN",
 		"-Xep:EqualsHashCode:WARN",
-		"-Xep:EqualsNull:WARN",
 		"-Xep:EqualsReference:WARN",
 		"-Xep:FormatString:WARN",
 		"-Xep:FromTemporalAccessor:WARN",