The test suite currently accepts invalid values for GOT_TEST_ALGO
and implcitly uses sha1. With this patch 'git init' will error
out on invalid values, causing the tests to spew lots of errors,
including the git init error about an invalid object format (more erros
result from tests continuing even though test_init failed).

Perhaps not the most user-friendly way but effective when someone
makes a mistake specifying the algorithm.

ok?

diff /home/stsp/src/got
commit - 11f34534de34dc3b24c47b54c86b1fd8aaf8699d
path + /home/stsp/src/got
blob - 41051e07321fad9c5140c71182b0ca7d9fef2410
file + regress/cmdline/common.sh
--- regress/cmdline/common.sh
+++ regress/cmdline/common.sh
@@ -36,13 +36,8 @@ export MALLOC_OPTIONS=S
 
 git_init()
 {
-	args=
-	if [ "${GOT_TEST_ALGO}" = sha256 ]; then
-		args="--object-format=sha256"
-	fi
+	git init -q --object-format=${GOT_TEST_ALGO} "$1"
 
-	git init -q $args "$1"
-
 	# Switch the default branch to match our test expectations if needed.
 	# Only need to change HEAD since 'git init' did not create any refs.
 	# Relying on implementation details of 'git init' is no problem for us.