shim: tpm.c: Make sure old_caps is initialized in tpm2 code.
shim: tpm.c: Make sure old_caps is initialized in tpm2 code.

clang-analyzer caught this.

Signed-off-by: Peter Jones <2e0a021e603479ff81838c00c3b770daca4e0214@redhat.com>

rhinstaller/shim,rhinstaller/shim,rhinstaller/shim