Smatch complains that "area_free" could be used without being
initialized.  This code is several years old and premusably works fine
so this can't be a very serious bug.  But it's easy enough to silence
the warning.  If "area_free" is false at the end of the function then
we return -ENOMEM.

Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/gpu/drm/omapdrm/tcm-sita.c 
b/drivers/gpu/drm/omapdrm/tcm-sita.c
index d7f7bc9f061a..817be3c41863 100644
--- a/drivers/gpu/drm/omapdrm/tcm-sita.c
+++ b/drivers/gpu/drm/omapdrm/tcm-sita.c
@@ -90,7 +90,7 @@ static int l2r_t2b(u16 w, u16 h, u16 a, s16 offset,
 {
        int i;
        unsigned long index;
-       bool area_free;
+       bool area_free = false;
        unsigned long slots_per_band = PAGE_SIZE / slot_bytes;
        unsigned long bit_offset = (offset > 0) ? offset / slot_bytes : 0;
        unsigned long curr_bit = bit_offset;
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