Fixed overflow_threshold overflow when using 256G of memory

The current implementation using an 'int' runs into an
overflow when specifying 256G of memory.
This patch fixed the problem changing the 'int' into a 'long long'.

Signed-off-by: Andreas Florath <[email protected]>

src/cooccur.c

@@ -291,7 +291,7 @@ int get_cooccurrence() {
 
     // if symmetric > 0, we can increment ind twice per iteration,
     // meaning up to 2x window_size in one loop
-    int overflow_threshold = symmetric == 0 ? overflow_length - window_size : overflow_length - 2 * window_size;
+    long long const overflow_threshold = symmetric == 0 ? overflow_length - window_size : overflow_length - 2 * window_size;
 
     /* For each token in input stream, calculate a weighted cooccurrence sum within window_size */
     while (1) {