It seems we have a regression, the fuse mount is simply crashing after start, here's ASAN output:
```
=================================================================
==126984==ERROR: AddressSanitizer: attempting free on address which was not malloc()-ed: 0x6030000158f5 in thread T2
#0 0x7f85cbad17e0 in __interceptor_free (/lib64/libasan.so.5+0xef7e0)
#1 0x4079a2 in xrootdfs_init /home/simonm/git/xrootd/src/XrdFfs/XrdFfsXrootdfs.cc:146
#2 0x7f85cb32a6de in fuse_fs_init (/lib64/libfuse.so.2+0x126de)
#3 0x7f85cb32e9b8 (/lib64/libfuse.so.2+0x169b8)
#4 0x7f85cb32f867 (/lib64/libfuse.so.2+0x17867)
#5 0x7f85cb32c43f (/lib64/libfuse.so.2+0x1443f)
#6 0x7f85ca7d11c9 in start_thread (/lib64/libpthread.so.0+0x81c9)
#7 0x7f85ca43cdd2 in clone (/lib64/libc.so.6+0x39dd2)
0x6030000158f5 is located 21 bytes inside of 22-byte region [0x6030000158e0,0x6030000158f6)
allocated by thread T2 here:
#0 0x7f85cba1dda0 in strdup (/lib64/libasan.so.5+0x3bda0)
#1 0x407902 in xrootdfs_init /home/simonm/git/xrootd/src/XrdFfs/XrdFfsXrootdfs.cc:137
Thread T2 created by T0 here:
#0 0x7f85cba34ea3 in __interceptor_pthread_create (/lib64/libasan.so.5+0x52ea3)
#1 0x7f85cb32c198 (/lib64/libfuse.so.2+0x14198)
SUMMARY: AddressSanitizer: bad-free (/lib64/libasan.so.5+0xef7e0) in __interceptor_free
==126984==ABORTING
```
It must have been introduced in 963ac9795ce47fe52b4c5b1d96cb88fea0218528
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