Fixed some compiler warnings and a (rather nonexistent) memory leak

This silences clang and gcc with -O2 -Wall -Wextra

src/browser.c

@@ -152,7 +152,7 @@ static void browse_draw_item(struct dir *n, int row) {
 void browse_draw() {
   struct dir *t;
   char fmtsize[9], *tmp;
-  int selected, i;
+  int selected = 0, i;
 
   erase();
   t = dirlist_get(0);

src/dir_common.c

@@ -119,9 +119,9 @@ struct dir *dir_createstruct(const char *name) {
 
 static void draw_progress() {
   static const char antext[] = "Scanning...";
-  static int anpos = 0;
+  static size_t anpos = 0;
   char ani[20] = {};
-  int i;
+  size_t i;
   int width = wincols-5;
 
   nccreate(10, width, "Scanning...");

src/dir_scan.c

@@ -248,8 +248,10 @@ int dir_scan_process() {
     dir_seterr("Error reading directory: %s", strerror(errno));
 
   /* Special case: empty directory = error */
-  if(!dir_fatalerr && !*dir)
+  if(!dir_fatalerr && !*dir) {
     dir_seterr("Directory empty");
+    free(dir);
+  }
 
   if(!dir_fatalerr) {
     curdev = fs.st_dev;

src/path.c

@@ -127,7 +127,7 @@ static char *path_absolute(const char *path) {
 /* NOTE: cwd and the memory cur points to are unreliable after calling this function */
 static char *path_real_rec(char *cur, int *links) {
   int i, n, tmpl, lnkl = 0;
-  char **arr, *tmp, *lnk, *ret = NULL;
+  char **arr, *tmp, *lnk = NULL, *ret = NULL;
 
   tmpl = strlen(cur)+1;
   tmp = malloc(tmpl);