Use size_t for command length

The size of an array should have type size_t.

app/src/command.c

@@ -37,7 +37,7 @@ show_adb_err_msg(enum process_result err) {
 }
 
 process_t
-adb_execute(const char *serial, const char *const adb_cmd[], int len) {
+adb_execute(const char *serial, const char *const adb_cmd[], size_t len) {
     const char *cmd[len + 4];
     int i;
     process_t process;

app/src/command.h

@@ -49,7 +49,7 @@ bool
 cmd_simple_wait(process_t pid, exit_code_t *exit_code);
 
 process_t
-adb_execute(const char *serial, const char *const adb_cmd[], int len);
+adb_execute(const char *serial, const char *const adb_cmd[], size_t len);
 
 process_t
 adb_forward(const char *serial, uint16_t local_port,