resources: tests: Plug a mem leak

resources: tests: Plug a mem leak

==27820== 31 bytes in 1 blocks are definitely lost in loss record 587 of 866
==27820==    at 0x402AD89: malloc (vg_replace_malloc.c:236)
==27820==    by 0x4084724: standard_malloc (gmem.c:85)
==27820==    by 0x40847C7: g_malloc (gmem.c:159)
==27820==    by 0x4084AB4: g_malloc_n (gmem.c:361)
==27820==    by 0x409D6A1: g_strdup (gstrfuncs.c:356)
==27820==    by 0x4069FF7: g_get_current_dir (gfileutils.c:2544)
==27820==    by 0x804BCA7: test_resource_module (resources.c:370)