Very minor optimization to hint gcc.

Signed-off-by: Andrea Arcangeli <redacted>
---
 kernel/fork.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/fork.c b/kernel/fork.c
index ab5211b..5fcfa70 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c

@@ -572,7 +572,7 @@ struct mm_struct *mm_alloc(void)
 	struct mm_struct *mm;
 
 	mm = allocate_mm();
-	if (!mm)
+	if (unlikely(!mm))
 		return NULL;
 
 	memset(mm, 0, sizeof(*mm));

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