rpcrt4: Initialise the array to be marshalled in test_conformant_array.

dlls/rpcrt4/tests/ndr_marshall.c

@@ -1315,6 +1315,7 @@ static void test_conformant_array(void)
     void *ptr;
     unsigned char *mem, *mem_orig;
     unsigned char memsrc[20];
+    unsigned int i;
 
     static const unsigned char fmtstr_conf_array[] =
     {
@@ -1328,6 +1329,9 @@ static void test_conformant_array(void)
         0x5b               /* FC_END */
     };
 
+    for (i = 0; i < sizeof(memsrc); i++)
+        memsrc[i] = i * i;
+
     StubDesc = Object_StubDesc;
     StubDesc.pFormatTypes = fmtstr_conf_array;