Update to NSPR 4.10.2.

nspr/pr/src/linking/prlink.c

 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "primpl.h"
 
 #include <string.h>
 
 #ifdef XP_BEOS
@@ skipping 941 matching lines @@
 
 /*
 ** Unload a shared library which was loaded via PR_LoadLibrary
 */
 PR_IMPLEMENT(PRStatus) 
 PR_UnloadLibrary(PRLibrary *lib)
 {
     int result = 0;
     PRStatus status = PR_SUCCESS;
 
-    if ((lib == 0) || (lib->refCount <= 0)) {
+    if (lib == 0) {
         PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
         return PR_FAILURE;
     }
 
     PR_EnterMonitor(pr_linker_lock);
+
+    if (lib->refCount <= 0) {
+        PR_ExitMonitor(pr_linker_lock);
+        PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+        return PR_FAILURE;
+    }
+
     if (--lib->refCount > 0) {
     PR_LOG(_pr_linker_lm, PR_LOG_MIN,
            ("%s decr => %d",
         lib->name, lib->refCount));
     goto done;
     }
 
 #ifdef XP_BEOS
     if(((image_id)lib->stub_dlh) == B_ERROR)
         unload_add_on( (image_id) lib->dlh );
@@ skipping 614 matching lines @@
     result = PR_Malloc(strlen(module_name)+1);
     if (result != NULL) {
         strcpy(result, module_name);
     }
     return result;
 #else
     PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
     return NULL;
 #endif
 }