Description: perf expr: Fix missing check for return value of hashmap__new()
References:
Notes:
 bwh> This is user-space code, and the result of the missing check
 bwh> would be a segfault.  I don't see any security impact.
Bugs:
upstream: released (5.16-rc6) [0a515a06c5ebfa46fee3ac519e418f801e718da4]
6.1-upstream-stable: N/A "Fixed before branching point"
5.10-upstream-stable: ignored "Not a security issue"
4.19-upstream-stable: ignored "Not a security issue"
sid: released (5.16.7-1)
6.1-bookworm-security: N/A "Fixed before branch point"
5.10-bullseye-security: ignored "Not a security issue"
4.19-buster-security: ignored "Not a security issue"