only get the file pointer if fd is actually valid.
commit7dd7ffe5b79edd2b6d17c553f780e656b3ad8082
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
parente58b5633055e393daafe1abb7d5453cb32e70b01
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