resources: tests: Plug a mem leak

resources: tests: Plug a mem leak

==509== 700 (20 direct, 680 indirect) bytes in 1 blocks are definitely lost in loss record 828 of 837
==509==    at 0x402AD89: malloc (vg_replace_malloc.c:236)
==509==    by 0x4084724: standard_malloc (gmem.c:85)
==509==    by 0x40847C7: g_malloc (gmem.c:159)
==509==    by 0x409B1E1: g_slice_alloc (gslice.c:1003)
==509==    by 0x405396B: g_bytes_new_with_free_func (gbytes.c:173)
==509==    by 0x405390D: g_bytes_new_take (gbytes.c:122)
==509==    by 0x804A48C: test_resource_data (resources.c:174)