Fixing incorrect return type

userprog/syscall_filesize.c

@@ -7,7 +7,7 @@
 #include "system_calls.h"
 #include "filesys/file.h"
 
-int syscall_filesize(struct intr_frame *f) {
+void syscall_filesize(struct intr_frame *f) {
 	// pop off first int argument from interrupt frame
 	int file_descriptor = *((int*)f->esp + 1);
 	struct file *file = get_associated_file_pointer(file_descriptor);