Fixed invalid read issue

Fixed invalid read issue

==4662== Invalid read of size 4
==4662==    at 0x491D9EC: g_slist_last (in /usr/lib/libglib-2.0.so.0.5200.2)
==4662==  Address 0x514dfd4 is 0 bytes after a block of size 4 alloc'd
==4662==    at 0x484801C: calloc (vg_replace_malloc.c:711)
==4662==    by 0x489216B: _wifi_specific_scan_create (wifi_internal.c:3341)
==4662==    by 0x48985E7: wifi_manager_specific_scan_create (wifi_manager.c:1678)
==4662==    by 0x10F821: test_wifi_manager_specific_ap_start_multi_scan (wifi_manager_test.c:2972)
==4662==    by 0x11022B: test_thread (wifi_manager_test.c:3420)
==4662==    by 0x48FD8E7: g_main_context_dispatch (in /usr/lib/libglib-2.0.so.0.5200.2)
==4662==    by 0x48FDC77: ??? (in /usr/lib/libglib-2.0.so.0.5200.2)
==4662==    by 0x48FDFD7: g_main_loop_run (in /usr/lib/libglib-2.0.so.0.5200.2)
==4662==    by 0x10B353: main (wifi_manager_test.c:3215)
==4662==
==4662== Invalid write of size 4
==4662==    at 0x491DA34: g_slist_append (in /usr/lib/libglib-2.0.so.0.5200.2)
==4662==    by 0x4892213: _wifi_specific_scan_set_ssid (wifi_internal.c:3365)
==4662==    by 0x10F92F: test_wifi_manager_specific_ap_start_multi_scan (wifi_manager_test.c:3001)
==4662==    by 0x11022B: test_thread (wifi_manager_test.c:3420)
==4662==    by 0x48FD8E7: g_main_context_dispatch (in /usr/lib/libglib-2.0.so.0.5200.2)
==4662==    by 0x48FDC77: ??? (in /usr/lib/libglib-2.0.so.0.5200.2)
==4662==    by 0x48FDFD7: g_main_loop_run (in /usr/lib/libglib-2.0.so.0.5200.2)
==4662==    by 0x10B353: main (wifi_manager_test.c:3215)
==4662==  Address 0x514dfd4 is 0 bytes after a block of size 4 alloc'd
==4662==    at 0x484801C: calloc (vg_replace_malloc.c:711)
==4662==    by 0x489216B: _wifi_specific_scan_create (wifi_internal.c:3341)
==4662==    by 0x48985E7: wifi_manager_specific_scan_create (wifi_manager.c:1678)
==4662==    by 0x10F821: test_wifi_manager_specific_ap_start_multi_scan (wifi_manager_test.c:2972)
==4662==    by 0x11022B: test_thread (wifi_manager_test.c:3420)
==4662==    by 0x48FD8E7: g_main_context_dispatch (in /usr/lib/libglib-2.0.so.0.5200.2)
==4662==    by 0x48FDC77: ??? (in /usr/lib/libglib-2.0.so.0.5200.2)
==4662==    by 0x48FDFD7: g_main_loop_run (in /usr/lib/libglib-2.0.so.0.5200.2)
==4662==    by 0x10B353: main (wifi_manager_test.c:3215)

Change-Id: I5aac1a17c015925785304315940e14583ae9dec5
Signed-off-by: Saurav Babu <saurav.babu@samsung.com>