[OpenMP][Fix] Fix test array initialization. (#74799)

Fix test array initialization.

GitOrigin-RevId: d41368134478d1d41726aa85ba82f49b5bce130c
diff --git a/libomptarget/test/offloading/back2back_distribute.c b/libomptarget/test/offloading/back2back_distribute.c
index 750e390..4910d41 100644
--- a/libomptarget/test/offloading/back2back_distribute.c
+++ b/libomptarget/test/offloading/back2back_distribute.c
@@ -15,12 +15,12 @@
 }
 
 int main(int argc, char *argv[]) {
-  double * a = (double *) malloc(MAX_N * sizeof(double));
-  double * a_h = (double *) malloc(MAX_N * sizeof(double));
-  double * d = (double *) malloc(MAX_N * sizeof(double));
-  double * d_h = (double *) malloc(MAX_N * sizeof(double));
-  double * b = (double *) malloc(MAX_N * sizeof(double));
-  double * c = (double *) malloc(MAX_N * sizeof(double));
+  double *a = (double *)calloc(MAX_N * sizeof(double));
+  double *a_h = (double *)calloc(MAX_N * sizeof(double));
+  double *d = (double *)calloc(MAX_N * sizeof(double));
+  double *d_h = (double *)calloc(MAX_N * sizeof(double));
+  double *b = (double *)calloc(MAX_N * sizeof(double));
+  double *c = (double *)calloc(MAX_N * sizeof(double));
 
 #pragma omp target enter data map(to:a[:MAX_N],b[:MAX_N],c[:MAX_N],d[:MAX_N])