tpm2_getmanufec: simplify commands exit code error checking for test
tpm2_getmanufec: simplify commands exit code error checking for test

Many tests are now defining a handler for Bash's ERR signal to avoid the
need to check the exit status for each executed command. Do the same for
the test_tpm2_getmanufec.sh script.

Signed-off-by: Javier Martinez Canillas <8fdf2abf85d34ea8f3f979ef25dc1f25d94aca29@redhat.com>

martinezjavier/tpm2-tools,01org/tpm2.0-tools,martinezjavier/tpm2-tools,01org/tpm2.0-tools,martinezjavier/tpm2-tools,01org/tpm2.0-tools,martinezjavier/tpm2-tools