Fix static-analyzer memory leak warnings.

Fix static-analyzer memory leak warnings.

system/extras/simpleperf/record_test.cpp:77:3: warning: Potential leak
of memory pointed to by 'r2'

system/extras/simpleperf/record_test.cpp:77:3: warning: Potential leak
of memory pointed to by 'r3'

system/extras/simpleperf/record_test.cpp:77:3: warning: Potential leak
of memory pointed to by 'r4'

Bug: None.
Test: Now builds without those warnings, and
`simpleperf_unit_test -t system/extras/simpleperf/testdata` passes.
Change-Id: Ie77955367efeeba13173e2542eba02727b298f86