mm: cma: retry only on EBUSY

Retry the cma alloc only when alloc_contig_range returns
-EBUSY. This avoids unnecessary retries when the heap is
full.

Change-Id: If4626f0a0bc14e4b3a500283eb5a4c33b78fb6f2
Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>
1 file changed