Description of problem:
    This is the asan trace:
    ==1482==ERROR: AddressSanitizer: heap-use-after-free on address 0x60300000db70 at pc 0x7ffff0bfb93f bp 0x7fffffffc830 sp 0x7fffffffc820
    READ of size 8 at 0x60300000db70 thread T0
        #0 0x7ffff0bfb93e in gluster_free_server /root/tcmu-runner/glfs.c:270
        #1 0x7ffff0bfc851 in tcmu_create_glfs_object /root/tcmu-runner/glfs.c:415
        #2 0x7ffff0bfcda3 in tcmu_glfs_open /root/tcmu-runner/glfs.c:503
        #3 0x417ced in dev_added /root/tcmu-runner/main.c:678
        #4 0x7ffff6c12662 in add_device /root/tcmu-runner/libtcmu.c:296
        #5 0x7ffff6c13503 in open_devices /root/tcmu-runner/libtcmu.c:436
        #6 0x7ffff6c13c62 in tcmulib_initialize /root/tcmu-runner/libtcmu.c:477
        #7 0x418720 in main /root/tcmu-runner/main.c:871
        #8 0x7ffff5500400 in __libc_start_main (/lib64/libc.so.6+0x20400)
        #9 0x407dd9 in _start (/root/tcmu-runner/tcmu-runner+0x407dd9)
    
    0x60300000db70 is located 0 bytes inside of 24-byte region [0x60300000db70,0x60300000db88)
    freed by thread T0 here:
        #0 0x7ffff6efbb00 in free (/lib64/libasan.so.3+0xc6b00)
        #1 0x7ffff0bfbaa8 in gluster_free_server /root/tcmu-runner/glfs.c:276
        #2 0x7ffff0bfc336 in parse_imagepath /root/tcmu-runner/glfs.c:347
        #3 0x7ffff0bfc464 in tcmu_create_glfs_object /root/tcmu-runner/glfs.c:360
        #4 0x7ffff0bfcda3 in tcmu_glfs_open /root/tcmu-runner/glfs.c:503
        #5 0x417ced in dev_added /root/tcmu-runner/main.c:678
        #6 0x7ffff6c12662 in add_device /root/tcmu-runner/libtcmu.c:296
        #7 0x7ffff6c13503 in open_devices /root/tcmu-runner/libtcmu.c:436
        #8 0x7ffff6c13c62 in tcmulib_initialize /root/tcmu-runner/libtcmu.c:477
        #9 0x418720 in main /root/tcmu-runner/main.c:871
        #10 0x7ffff5500400 in __libc_start_main (/lib64/libc.so.6+0x20400)
    
    previously allocated by thread T0 here:
        #0 0x7ffff6efc020 in calloc (/lib64/libasan.so.3+0xc7020)
        #1 0x7ffff0bfbbe5 in parse_imagepath /root/tcmu-runner/glfs.c:299
        #2 0x7ffff0bfc464 in tcmu_create_glfs_object /root/tcmu-runner/glfs.c:360
        #3 0x7ffff0bfcda3 in tcmu_glfs_open /root/tcmu-runner/glfs.c:503
        #4 0x417ced in dev_added /root/tcmu-runner/main.c:678
        #5 0x7ffff6c12662 in add_device /root/tcmu-runner/libtcmu.c:296
        #6 0x7ffff6c13503 in open_devices /root/tcmu-runner/libtcmu.c:436
        #7 0x7ffff6c13c62 in tcmulib_initialize /root/tcmu-runner/libtcmu.c:477
        #8 0x418720 in main /root/tcmu-runner/main.c:871
        #9 0x7ffff5500400 in __libc_start_main (/lib64/libc.so.6+0x20400)


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