Revert "Fix #10; skipping final bit in flip.c"

This reverts commit 0b143a0.

Author: fsaad

src/c/flip.c

@@ -11,27 +11,15 @@
 
 #include "flip.h"
 
-static int k = 31;
+static int k = 30;
 static int flip_word = 0;
-static int flip_pos = 31;
+static int flip_pos = 0;
 
 int flip(void){
-    if (flip_pos == k) {
+    if (flip_pos == 0) {
         flip_word = rand();
-        flip_pos = 0;
+        flip_pos = k;
     }
-    return (flip_word >> flip_pos++) & 1;
+    --flip_pos;
+    return (flip_word >> flip_pos) & 1;
 }
-
-// Old implementation scans from lower-to-higher order bits,
-// but rand() has poor quality on lower order bits.
-// int flip(void){
-//     static int k = 31;
-//     static int flip_word = 0;
-//     static int flip_pos = 0;
-//     if (flip_pos == 0) {
-//         flip_word = rand();
-//         flip_pos = k;
-//     }
-//     return (flip_word >> --flip_pos) & 1;
-// }