libfreerdp-utils/memory: add a pointer check in xstrdup.

diff --git a/libfreerdp-utils/memory.c b/libfreerdp-utils/memory.c
index f20c9d2..a3077fd 100644 (file)
--- a/libfreerdp-utils/memory.c
+++ b/libfreerdp-utils/memory.c
@@ -105,6 +105,9 @@ char* xstrdup(const char* str)
 {
        char* mem;
 
+       if (str == NULL)
+               return NULL;
+
 #ifdef _WIN32
        mem = _strdup(str);
 #else