Fix memory leak in string created for strtok.

Reported by static analyzer:

system/libvintf/assemble_vintf.cpp:100:18: warning: Potential leak of
memory pointed to by 'modPath' [clang-analyzer-cplusplus.NewDeleteLeaks]

Bug: b/27101951
Test: verified warning is gone.

Change-Id: Iab26bc356e3df2a811ad7d34228533ea5dcd8edb
1 file changed