Miscellaneous tiny fixes here and there.

* fileio.c (Ffile_name_as_directory, Fdirectory_file_name):
Remove dead NILP check.
* image.c (Flookup_image): Use regular format for docstring.
* keyboard.c (apply_modifiers_uncached): Use stpcpy.

src/ChangeLog

+2015-01-12  Dmitry Antipov  <dmantipov@yandex.ru>
+
+	* fileio.c (Ffile_name_as_directory, Fdirectory_file_name):
+	Remove dead NILP check.
+	* image.c (Flookup_image): Use regular format for docstring.
+	* keyboard.c (apply_modifiers_uncached): Use stpcpy.
+
 2015-01-12  Martin Rudalics  <rudalics@gmx.at>
 	* dispnew.c (change_frame_size_1): Pass Qchange_frame_size to

src/fileio.c

@@ -522,8 +522,6 @@ For a Unix-syntax file name, just appends a slash.  */)
   USE_SAFE_ALLOCA;
 
   CHECK_STRING (file);
-  if (NILP (file))
-    return Qnil;
 
   /* If the file name has special constructs in it,
      call the corresponding file handler.  */
@@ -591,9 +589,6 @@ In Unix-syntax, this function just removes the final slash.  */)
 
   CHECK_STRING (directory);
 
-  if (NILP (directory))
-    return Qnil;
-
   /* If the file name has special constructs in it,
      call the corresponding file handler.  */
   handler = Ffind_file_name_handler (directory, Qdirectory_file_name);

src/image.c

@@ -9288,7 +9288,8 @@ DEFUN ("imagep", Fimagep, Simagep, 1, 1, 0,
 }
 
 
-DEFUN ("lookup-image", Flookup_image, Slookup_image, 1, 1, 0, "")
+DEFUN ("lookup-image", Flookup_image, Slookup_image, 1, 1, 0,
+       doc: /* */)
   (Lisp_Object spec)
 {
   ptrdiff_t id = -1;

src/keyboard.c

@@ -6270,10 +6270,10 @@ apply_modifiers_uncached (int modifiers, char *base, int base_len, int base_len_
     if (modifiers & meta_modifier)  { *p++ = 'M'; *p++ = '-'; }
     if (modifiers & shift_modifier) { *p++ = 'S'; *p++ = '-'; }
     if (modifiers & super_modifier) { *p++ = 's'; *p++ = '-'; }
-    if (modifiers & double_modifier)  { strcpy (p, "double-");  p += 7; }
-    if (modifiers & triple_modifier)  { strcpy (p, "triple-");  p += 7; }
-    if (modifiers & down_modifier)  { strcpy (p, "down-");  p += 5; }
-    if (modifiers & drag_modifier)  { strcpy (p, "drag-");  p += 5; }
+    if (modifiers & double_modifier) p = stpcpy (p, "double-");
+    if (modifiers & triple_modifier) p = stpcpy (p, "triple-");
+    if (modifiers & down_modifier) p = stpcpy (p, "down-");
+    if (modifiers & drag_modifier) p = stpcpy (p, "drag-");
     /* The click modifier is denoted by the absence of other modifiers.  */
 
     *p = '\0';