bladeRF-fsk: correct calloc argument order in fir filter test

Prevents compiler error
- earlier calloc argument should specify number of elements, later size
  of each element
- failed in Fedora Linux 40 with gcc version 14.0.1 20240411 (Red Hat
  14.0.1-0) (GCC)

closes #965

host/utilities/bladeRF-fsk/c/src/fir_filter.c

@@ -213,18 +213,18 @@ int main(int argc, char *argv[])
         return EXIT_FAILURE;
     }
 
-    inbuf = calloc(2*sizeof(int16_t), chunk_size);
+    inbuf = calloc(chunk_size, 2*sizeof(int16_t));
     if (!inbuf) {
         perror("calloc");
         goto out;
     }
-    tempbuf = calloc(2*sizeof(int16_t), chunk_size);
+    tempbuf = calloc(chunk_size, 2*sizeof(int16_t));
     if (!tempbuf) {
         perror("calloc");
         goto out;
     }
 
-    outbuf = calloc(sizeof(struct complex_sample), chunk_size);
+    outbuf = calloc(chunk_size, sizeof(struct complex_sample));
     if (!outbuf) {
         perror("calloc");
         goto out;