test cases: Don't fall off the end of main() without an exit status

This is undefined behaviour, and seems to have caused test failures
when backporting Meson to an older toolchain in the Steam Runtime.

Signed-off-by: Simon McVittie <smcv@collabora.com>

3 files changed, 3 insertions, 0 deletions

diff --git a/test cases/common/141 special characters/arg-char-test.c b/test cases/common/141 special characters/arg-char-test.c
index 04e02f8e8..044857eed 100644
--- a/test cases/common/141 special characters/arg-char-test.c
+++ b/test cases/common/141 special characters/arg-char-test.c
@@ -7,4 +7,5 @@ int main(int argc, char **argv) {
   if (c != argv[1][0])
     fprintf(stderr, "Expected %x, got %x\n", (unsigned int) c, (unsigned int) argv[1][0]);
   assert(c == argv[1][0]);
+  return 0;
 }
diff --git a/test cases/common/141 special characters/arg-string-test.c b/test cases/common/141 special characters/arg-string-test.c
index 199fd7917..1d93f45c0 100644
--- a/test cases/common/141 special characters/arg-string-test.c
+++ b/test cases/common/141 special characters/arg-string-test.c
@@ -9,4 +9,5 @@ int main(int argc, char **argv) {
   if (s[0] != argv[1][0])
     fprintf(stderr, "Expected %x, got %x\n", (unsigned int) s[0], (unsigned int) argv[1][0]);
   assert(s[0] == argv[1][0]);
+  return 0;
 }
diff --git a/test cases/common/141 special characters/arg-unquoted-test.c b/test cases/common/141 special characters/arg-unquoted-test.c
index 7f679ca68..9c51bffdc 100644
--- a/test cases/common/141 special characters/arg-unquoted-test.c
+++ b/test cases/common/141 special characters/arg-unquoted-test.c
@@ -14,4 +14,5 @@ int main(int argc, char **argv) {
   assert(s[0] == argv[1][0]);
   // There is no way to convert a macro argument into a character constant.
   // Otherwise we'd test that as well
+  return 0;
 }