Minor, refactor and fix function doc comment

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

src/fisdir.c

@@ -25,17 +25,17 @@
 #include <unistd.h>
 
 /**
- * fexist - Check if a file exists and is a directory.
+ * fisdir - Check if a path exists and is a directory.
- * @file: File to look for, with full path.
+ * @path: Path to file or directory
  *
  * Returns:
- * %TRUE(1) if the file exists and is a directory, otherwise %FALSE(0).
+ * %TRUE(1) if @path exists and is a directory, otherwise %FALSE(0).
  */
-int fisdir(const char *file)
+int fisdir(const char *path)
 {
 	struct stat sb;
 
-	if (!stat(file, &sb) && S_ISDIR(sb.st_mode))
+	if (!stat(path, &sb) && S_ISDIR(sb.st_mode))
 		return 1;
 
 	return 0;

src/lite.h

@@ -57,7 +57,7 @@ char   *chomp      (char *str);
 char   *fparseln   (FILE *, size_t *, size_t *, const char[3], int);
 
 int     fexist     (const char *file);
-int     fisdir     (const char *file);
+int     fisdir     (const char *path);
 
 FILE   *tempfile   (void);
 ssize_t copyfile   (const char *src, const char *dst, int len, int opt);