Add missing `void`s for empty parameter list

app/src/adb/adb.c

@@ -70,7 +70,7 @@ argv_to_string(const char *const *argv, char *buf, size_t bufsize) {
 }
 
 static void
-show_adb_installation_msg() {
+show_adb_installation_msg(void) {
 #ifndef __WINDOWS__
     static const struct {
         const char *binary;

app/src/icon.c

@@ -271,7 +271,7 @@ error:
 }
 
 SDL_Surface *
-scrcpy_icon_load() {
+scrcpy_icon_load(void) {
     char *icon_path = get_icon_path();
     if (!icon_path) {
         return NULL;

app/src/scrcpy.c

@@ -297,7 +297,7 @@ sc_timeout_on_timeout(struct sc_timeout *timeout, void *userdata) {
 
 // Generate a scrcpy id to differentiate multiple running scrcpy instances
 static uint32_t
-scrcpy_generate_scid() {
+scrcpy_generate_scid(void) {
     struct sc_rand rand;
     sc_rand_init(&rand);
     // Only use 31 bits to avoid issues with signed values on the Java-side

app/tests/test_str.c

@@ -358,7 +358,7 @@ static void test_index_of_column(void) {
     assert(sc_str_index_of_column("  a bc  d", 1, " ") == 2);
 }
 
-static void test_remove_trailing_cr() {
+static void test_remove_trailing_cr(void) {
     char s[] = "abc\r";
     sc_str_remove_trailing_cr(s, sizeof(s) - 1);
     assert(!strcmp(s, "abc"));

app/tests/test_vecdeque.c

@@ -102,7 +102,7 @@ static void test_vecdeque_reserve(void) {
     sc_vecdeque_destroy(&vdq);
 }
 
-static void test_vecdeque_grow() {
+static void test_vecdeque_grow(void) {
     struct SC_VECDEQUE(int) vdq = SC_VECDEQUE_INITIALIZER;
 
     bool ok = sc_vecdeque_reserve(&vdq, 20);
@@ -142,7 +142,7 @@ static void test_vecdeque_grow() {
     sc_vecdeque_destroy(&vdq);
 }
 
-static void test_vecdeque_push_hole() {
+static void test_vecdeque_push_hole(void) {
     struct SC_VECDEQUE(int) vdq = SC_VECDEQUE_INITIALIZER;
 
     bool ok = sc_vecdeque_reserve(&vdq, 20);

app/tests/test_vector.c

@@ -187,7 +187,7 @@ static void test_vector_index_of(void) {
     sc_vector_destroy(&vec);
 }
 
-static void test_vector_grow() {
+static void test_vector_grow(void) {
     struct SC_VECTOR(int) vec = SC_VECTOR_INITIALIZER;
 
     bool ok;