Change to use ENDIF rather than ELSE for CRIU_SUPPORT

The CRIU is enabled by default for the
Linux platforms. That means all the
Linux builds are CRIU. But it need a
command line option to enable it at
runtime if someone wants to use CRIU.

There was an error in our current code.
During the build, the preprocessor
eliminate the code in the [ELSE]
CRIU_SUPPORT. This would cause error if
the --enable-criu-support jvm option
is not enabled in an application. The
application need the logic within [ELSE]
CRIU_SUPPORT. Therefore, we use the
[ENDIF] to replace the [ELSE] in the code.

src/java.base/unix/classes/sun/security/provider/NativePRNG.java

@@ -508,8 +508,9 @@ private static void readFully(InputStream in, byte[] data, Variant variant)
                 if (in.readNBytes(data, 0, len) < len) {
                     throw new IOException("Could not read from file(s)");
                 }
+                return;
             }
-            /*[ELSE] CRIU_SUPPORT */
+            /*[ENDIF] CRIU_SUPPORT */
             int ofs = 0;
             while (len > 0) {
                 int k = in.read(data, ofs, len);
@@ -522,7 +523,6 @@ private static void readFully(InputStream in, byte[] data, Variant variant)
             if (len > 0) {
                 throw new IOException("Could not read from file(s)");
             }
-            /*[ENDIF] CRIU_SUPPORT */
         }
 
         // get true random bytes, just read from "seed"
@@ -634,8 +634,9 @@ private void implNextBytes(byte[] data) {
                         for (int i = 0; i < data.length; i++) {
                             data[i] ^= rawData[i];
                         }
+                        return;
                     }
-                    /*[ELSE] CRIU_SUPPORT */
+                    /*[ENDIF] CRIU_SUPPORT */
                     int data_len = data.length;
                     int ofs = 0;
                     int len;
@@ -665,7 +666,6 @@ private void implNextBytes(byte[] data) {
                         }
                     data_len -= len;
                     }
-                    /*[ENDIF] CRIU_SUPPORT */
                 } catch (IOException e){
                     throw new ProviderException("nextBytes() failed", e);
                 }