Fix an unused variable in NSPR

patches/nspr-unused-variable.patch

Index: patches/nspr-unused-variable.patch
diff --git a/patches/nspr-unused-variable.patch b/patches/nspr-unused-variable.patch
new file mode 100644
index 0000000000000000000000000000000000000000..c785842ce4c956ec774781e9f128218dd5492d2e
--- /dev/null
+++ b/patches/nspr-unused-variable.patch
@@ -0,0 +1,12 @@
+diff --git a/nspr/pr/src/io/prfdcach.c b/nspr/pr/src/io/prfdcach.c
+index 16892bc..17b71fe 100644
+--- a/nspr/pr/src/io/prfdcach.c
++++ b/nspr/pr/src/io/prfdcach.c
+@@ -213,7 +213,6 @@ void _PR_InitFdCache(void)
+ void _PR_CleanupFdCache(void)
+ {
+     PRFileDesc *fd, *next;
+-    PRStackElem *pop;
+ 
+     for (fd = _pr_fd_cache.head; fd != NULL; fd = next)
+     {