Revert "debuglog: Don't use nested functions"

This reverts commit 435dea9.

src/libs/debuglog/debuglog.c

@@ -20,18 +20,16 @@
 #include <stdio.h>
 #include <stdlib.h>
 
-static FILE* file = NULL;
-
-static void closefile() {
-	fclose(file);
-}
-
 void debuglog(const char* line, ...)
 {
+	static FILE* file = NULL;
 
 	if (file == NULL) {
 		file = fopen("debug.txt", "wt");
 
+		void closefile() {
+			fclose(file);
+		}
 		atexit(closefile);
 	}