Workaround for uninitialized union clang bug
Workaround for uninitialized union clang bug

* Clang does not generate code to initialize the entire union when
  initializing a nested struct. This is the case for union bpf_attr.
  As a workaround, call memset explicitly.

Signed-off-by: Brenden Blanco <8e41c261aa8ddb01230a40c21c26a049c1f6d041@plumgrid.com>

bpowers/bcc,mkacik/bcc,mshahbaz/bcc-deprecated,tuxology/bcc,romain-intel/bcc,tuxology/bcc,mcaleavya/bcc,arslanabbasi/bcc,iovisor/bcc,zaafar/bcc,bpowers/bcc,mbudiu-bfn/bcc,romain-intel/bcc,arslanabbasi/bcc,romain-intel/bcc,tuxology/bcc,brendangregg/bcc,zaafar/bcc,tuxology/bcc,mcaleavya/bcc,mcaleavya/bcc,brendangregg/bcc,brendangregg/bcc,mkacik/bcc,romain-intel/bcc,mkacik/bcc,iovisor/bcc,mshahbaz/bcc-deprecated,shodoco/bcc,iovisor/bcc,iovisor/bcc,mbudiu-bfn/bcc,mcaleavya/bcc,mshahbaz/bcc-deprecated,mkacik/bcc,brendangregg/bcc,mshahbaz/bcc-deprecated,mbudiu-bfn/bcc,zaafar/bcc,mbudiu-bfn/bcc,bpowers/bcc,tuxology/bcc,zaafar/bcc,shodoco/bcc,mshahbaz/bcc-deprecated,brendangregg/bcc,mcaleavya/bcc,shodoco/bcc,shodoco/bcc,mbudiu-bfn/bcc,zaafar/bcc,bpowers/bcc,mkacik/bcc,romain-intel/bcc,arslanabbasi/bcc,bpowers/bcc,shodoco/bcc,arslanabbasi/bcc,iovisor/bcc,arslanabbasi/bcc