Fix handling of one case, should be a good memmem() now.

git-svn-id: https://svn.code.sf.net/p/vbam/code/trunk@517 a31d4220-a93d-0410-bf67-fe4944624d44

src/win32/protect.c

@@ -8,6 +8,8 @@
 
 static uint8_t *memmem(const uint8_t *haystack, size_t haystacklen, const uint8_t *needle, size_t needlelen)
 {
+  if (needlelen)
+  {
     if (needlelen <= haystacklen)
     {
       haystacklen -= needlelen-1;
@@ -20,6 +22,11 @@ static uint8_t *memmem(const uint8_t *haystack, size_t haystacklen, const uint8_
         ++haystack;
       }
     }
+  }
+  else
+  {
+    return((uint8_t *)haystack);
+  }
   return(0);
 }