lib/mpi: mpi_write_sgl(): fix style issue with lzero decrement

Within the copying loop in mpi_write_sgl(), we have

  if (lzeros > 0) {
    ...
    lzeros -= sizeof(alimb);
  }

However, at this point, lzeros < sizeof(alimb) holds. Make this fact
explicit by rewriting the above to

  if (lzeros) {
    ...
    lzeros = 0;
  }

Signed-off-by: Nicolai Stange <nicstange@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/mpi/mpicoder.c b/lib/mpi/mpicoder.c
index 6bb52beb06b0..d8b372b9cc11 100644
--- a/lib/mpi/mpicoder.c
+++ b/lib/mpi/mpicoder.c
@@ -402,14 +402,14 @@ int mpi_write_to_sgl(MPI a, struct scatterlist *sgl, unsigned *nbytes,
 #else
 #error please implement for this limb size.
 #endif
-                if (lzeros > 0) {
+                if (lzeros) {
                         mpi_limb_t *limb1 = (void *)p - sizeof(alimb);
                         mpi_limb_t *limb2 = (void *)p - sizeof(alimb)
                                 + lzeros;
                         *limb1 = *limb2;
                         p -= lzeros;
                         y = lzeros;
-                        lzeros -= sizeof(alimb);
+                        lzeros = 0;
                 }
 
                 p = p - (sizeof(alimb) - y);