only get the file pointer if fd is actually valid.
commitfbc2c2c2377ec6effd74101beca1ed97e16f83f0
authorgevaerts <gevaerts@a1c6a512-1295-4272-9138-f99709370657>
Wed, 23 Dec 2009 21:51:29 +0000 (23 21:51 +0000)
committergevaerts <gevaerts@a1c6a512-1295-4272-9138-f99709370657>
Wed, 23 Dec 2009 21:51:29 +0000 (23 21:51 +0000)
tree328d8f6541c73e4c0b66362edaa794b88018b5db
parente369e8063e52161b842def100a80e2ddaf783ed8
only get the file pointer if fd is actually valid.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24105 a1c6a512-1295-4272-9138-f99709370657
firmware/common/file.c