update from status

Author: carl-mastrangelo

core/src/main/java/io/grpc/Status.java

@@ -319,6 +319,13 @@ public static Status fromCodeValue(int codeValue) {
 
   @SuppressWarnings("fallthrough")
   private static Status fromCodeValue(byte[] asciiCodeValue) {
+    if (asciiCodeValue.length == 1 && asciiCodeValue[0] == '0') {
+      return Status.OK;
+    }
+    return fromCodeValueSlow(asciiCodeValue);
+  }
+
+  private static Status fromCodeValueSlow(byte[] asciiCodeValue) {
     int index = 0;
     int codeValue = 0;
     switch (asciiCodeValue.length) {