tree: Fix leaking struct nvme_ns.generic_name

[tbzatek]

==306445== 96 bytes in 16 blocks are definitely lost in loss record 3,171 of 3,553
==306445==    at 0x484386F: malloc (vg_replace_malloc.c:393)
==306445==    by 0x4FA2F6D: strdup (strdup.c:42)
==306445==    by 0x7B9C477: nvme_ns_set_generic_name (tree.c:1802)
==306445==    by 0x7B9C51B: nvme_ns_open (tree.c:1820)
==306445==    by 0x7B9C606: __nvme_scan_namespace (tree.c:1853)
==306445==    by 0x7B9CA0C: nvme_subsystem_scan_namespace (tree.c:1931)
==306445==    by 0x7B98C81: nvme_subsystem_scan_namespaces (tree.c:496)
==306445==    by 0x7B991BC: nvme_scan_subsystem (tree.c:597)
==306445==    by 0x7B97DA1: nvme_scan_topology (tree.c:118)
==306445==    by 0x7B97FA9: nvme_scan (tree.c:177)

[codecov-commenter]

Codecov Report

Merging #548 (9eaeb31) into master (403e843) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #548      +/-   ##
==========================================
- Coverage   24.30%   24.30%   -0.01%     
==========================================
  Files          32       32              
  Lines        6134     6135       +1     
  Branches     1278     1278              
==========================================
  Hits         1491     1491              
- Misses       4129     4130       +1     
  Partials      514      514              

Impacted Files	Coverage Δ
src/nvme/tree.c	8.62% <0.00%> (-0.01%)	⬇️

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