8273162: AbstractSplittableWithBrineGenerator does not create a random salt

Backport-of: 5e1df2c7d71e9393beaa4fd2d8812b065d053392

Author: shipilev

src/java.base/share/classes/jdk/internal/util/random/RandomSupport.java

@@ -2380,7 +2380,7 @@ Spliterator<SplittableGenerator> makeSplitsSpliterator(long index, long fence, S
             long bits = nextLong();
             long multiplier = (1L << SALT_SHIFT) - 1;
             long salt = multiplier << (64 - SALT_SHIFT);
-            while ((salt & multiplier) != 0) {
+            while ((salt & multiplier) == 0) {
                 long digit = Math.multiplyHigh(bits, multiplier);
                 salt = (salt >>> SALT_SHIFT) | (digit << (64 - SALT_SHIFT));
                 bits *= multiplier;