HDDS-1800. Result of author check is inverted

Closes apache#1092

Author: adoroszlai

hadoop-ozone/dev-support/checks/author.sh

@@ -20,9 +20,8 @@ cd "$DIR/../../.." || exit 1
 AUTHOR="uthor"
 AUTHOR="@a${AUTHOR}"
 
-grep -r --include="*.java" "$AUTHOR" .
 if grep -r --include="*.java" "$AUTHOR" .; then
-  exit 0
-else
   exit 1
+else
+  exit 0
 fi