[PATCH i-g-t] runner: Remove useless null check for delim in job_list_from_test_list

[Gustavo Sousa]

The function job_list_from_test_list() uses a while loop to read entries
from the testlist.

The condition ((delim = strchr(binary, '@')) != NULL) checks if the
current entry specifies a subtest. When no subtest is specified, the
else clause will cause a jump to the next iteration. That means that we
are certain any statement executed after that if block has (delim !=
NULL). As such, all null checks on that variable after that point are
pointless.

In fact, certain unnecessary null checks might even cause confusion to
readers. One example is the block meant to display the "Unexpected test
without subtests ..." message: it would never happen, since that
condition is handled earlier in the iteration (i.e. the full set of
subtests is expanded for that entry in the else clause previously
mentioned). The following execution (done before this change)
illustrates that:

    $ cat <<EOF > /tmp/foo.testlist
    igt at xe_pm@s2idle-basic
    igt at xe_pm
    igt at xe_pm@s2idle-exec-after
    EOF

    $ ./build/runner/igt_runner -d -m --test-list /tmp/foo.testlist build/tests /tmp/results
    [36408.109043] Dry run, not executing. Invoke igt_resume if you want to execute.
    Done.

    $ cat /tmp/results/joblist.txt | sed 's/^\(.\{50\}\).\+/\1.../'
    xe_pm s2idle-basic
    xe_pm s2idle-basic,s2idle-basic-exec,s2idle-exec-a...
    xe_pm s2idle-exec-after

Let's remove those unnecessary checks.

Signed-off-by: Gustavo Sousa <gustavo.sousa at intel.com>
---
 runner/job_list.c | 21 +++++----------------
 1 file changed, 5 insertions(+), 16 deletions(-)

diff --git a/runner/job_list.c b/runner/job_list.c
index 27cbb10bce56..aeabb59f49d3 100644
--- a/runner/job_list.c
+++ b/runner/job_list.c
@@ -276,16 +276,7 @@ static bool job_list_from_test_list(struct job_list *job_list,
 			 * specified, also start a new entry.
 			 */
 			if (entry.binary && !strcmp(entry.binary, binary) &&
-			    (delim == NULL || strchr(delim, '@') == NULL)) {
-				if (!delim) {
-					/* ... except we didn't get a subtest */
-					fprintf(stderr,
-						"Error: Unexpected test without subtests "
-						"after same test had subtests\n");
-					free(binary);
-					fclose(f);
-					return false;
-				}
+			    strchr(delim, '@') == NULL) {
 				entry.subtest_count++;
 				entry.subtests = realloc(entry.subtests,
 							 entry.subtest_count *
@@ -303,7 +294,7 @@ static bool job_list_from_test_list(struct job_list *job_list,
 
 			memset(&entry, 0, sizeof(entry));
 
-			if (delim != NULL && strchr(delim, '@') != NULL) {
+			if (strchr(delim, '@') != NULL) {
 				/* Dynamic subtest specified. Add to job list alone. */
 				char **subtests;
 
@@ -314,11 +305,9 @@ static bool job_list_from_test_list(struct job_list *job_list,
 				any = true;
 			} else {
 				entry.binary = strdup(binary);
-				if (delim) {
-					entry.subtests = malloc(sizeof(*entry.subtests));
-					entry.subtests[0] = strdup(delim);
-					entry.subtest_count = 1;
-				}
+				entry.subtests = malloc(sizeof(*entry.subtests));
+				entry.subtests[0] = strdup(delim);
+				entry.subtest_count = 1;
 			}
 
 			free(binary);
-- 
2.44.0