tree-wide: drop duplicated blank lines

```
$ for i in */*.[ch] */*/*.[ch]; do sed -e '/^$/ {N; s/\n$//g}' -i $i; done
$ git checkout HEAD -- basic/linux shared/linux
```

3 files changed, 0 insertions, 3 deletions

diff --git a/src/test/test-execute.c b/src/test/test-execute.c
index d67b773d13..5b3e6875d6 100644
--- a/src/test/test-execute.c
+++ b/src/test/test-execute.c
@@ -747,7 +747,6 @@ static int run_tests(UnitFileScope scope, const test_entry tests[], char **patte
         return 0;
 }
 
-
 int main(int argc, char *argv[]) {
         _cleanup_(rm_rf_physical_and_freep) char *runtime_dir = NULL;
         _cleanup_free_ char *test_execute_path = NULL;
diff --git a/src/test/test-fileio.c b/src/test/test-fileio.c
index 1ad47a4aa3..56af5a8bc3 100644
--- a/src/test/test-fileio.c
+++ b/src/test/test-fileio.c
@@ -629,7 +629,6 @@ static void test_tempfn(void) {
 static const char chars[] =
         "Aąę„”\n루\377";
 
-
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wtype-limits"
 
diff --git a/src/test/test-proc-cmdline.c b/src/test/test-proc-cmdline.c
index 4e209de5b6..6d25a6919e 100644
--- a/src/test/test-proc-cmdline.c
+++ b/src/test/test-proc-cmdline.c
@@ -170,7 +170,6 @@ static void test_proc_cmdline_get_key_many(void) {
                                             "doubleticks", &value6,
                                             "zummm", &value7) == 5);
 
-
         assert_se(streq_ptr(value1, "quux"));
         assert_se(!value2);
         assert_se(streq_ptr(value3, "tuet"));