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check crypt output (rhbz#815605)

diff --git a/misc.c b/misc.c
index 43e93a2..178fda9 100644
--- a/misc.c
+++ b/misc.c
@@ -56,6 +56,8 @@ register const char *str;
 {
   register char *cp;
 
+  if(str == NULL)
+    Panic(0, "SaveStr() received NULL - possibly failed crypt()");
   if ((cp = malloc(strlen(str) + 1)) == NULL)
     Panic(0, "%s", strnomem);
   else