updpkgsums: add more error checking before replacementv4.2.0

Re-add some paranoia which was inadvertently lost with 768b65e934. In
case 'makepkg -g' fails to generate new sums (e.g. when a remote
resource cannot be fetched), or awk fails to write the new file (i have
no idea when this would happen), bail out with an error.

Signed-off-by: Allan McRae <allan@archlinux.org>

0 files changed, 0 insertions, 0 deletions