fs/fat/inode.c: clean up string initializations (char[] instead of char *)

Initializations like 'char *foo = "bar"' will create two variables: a
static string and a pointer (foo) to that static string.  Instead 'char
foo[] = "bar"' will declare a single variable and will end up in shorter
assembly (according to Jeff Garzik on the KernelJanitor's TODO list).

Signed-off-by: Manuel Schölling <manuel.schoelling@gmx.de>
Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>