examples: tx_samples_c: Fix memory leak

Fix memory leak: 'buff' was never freed.

While we're at it replace the kludgy malloc(n*y*sizeof(float))
by calloc(sizeof(float), n*y).

Signed-off-by: Moritz Fischer <moritz.fischer@ettus.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/host/examples/tx_samples_c.c b/host/examples/tx_samples_c.c
index eab061edb..f9001f2f1 100644
--- a/host/examples/tx_samples_c.c
+++ b/host/examples/tx_samples_c.c
@@ -185,7 +185,7 @@ int main(int argc, char* argv[]){
         uhd_tx_streamer_max_num_samps(tx_streamer, &samps_per_buff)
     )
     fprintf(stderr, "Buffer size in samples: %zu\n", samps_per_buff);
-    buff = malloc(samps_per_buff * 2 * sizeof(float));
+    buff = calloc(sizeof(float), samps_per_buff * 2);
     buffs_ptr = (const void**)&buff;
     size_t i = 0;
     for(i = 0; i < (samps_per_buff*2); i+=2){
@@ -205,7 +205,7 @@ int main(int argc, char* argv[]){
         if (stop_signal_called) break;
         if (total_num_samps > 0 && num_acc_samps >= total_num_samps) break;
 
-        EXECUTE_OR_GOTO(free_tx_streamer,
+        EXECUTE_OR_GOTO(free_buff,
             uhd_tx_streamer_send(tx_streamer, buffs_ptr, samps_per_buff, &md, 0.1, &num_samps_sent)
         )
 
@@ -216,6 +216,9 @@ int main(int argc, char* argv[]){
         }
     }
 
+    free_buff:
+        free(buff);
+
     free_tx_streamer:
         if(verbose){
             fprintf(stderr, "Cleaning up TX streamer.\n");