[PATCH] Replace division by zero with assert failure

[Vladimir 'φ-coder/phcoder' Serbinenko]

C specification says that division by zero is undefined and may not
provoke a signal. So it would be more appropriate to use gcry_assert

diff --git a/grub-core/lib/libgcrypt/mpi/mpi-pow.c
b/grub-core/lib/libgcrypt/mpi/mpi-pow.c
index a63fc6d..f5d2116 100644
--- a/grub-core/lib/libgcrypt/mpi/mpi-pow.c
+++ b/grub-core/lib/libgcrypt/mpi/mpi-pow.c
@@ -76,8 +76,7 @@ gcry_mpi_powm (gcry_mpi_t res,
   rp = res->d;
   ep = expo->d;

-  if (!msize)
-    msize = 1 / msize;     /* Provoke a signal.  */
+  gcry_assert (msize != 0);

   if (!esize)
     {
diff --git a/grub-core/lib/libgcrypt/mpi/mpih-div.c
b/grub-core/lib/libgcrypt/mpi/mpih-div.c
index 224b810..07dcf54 100644
--- a/grub-core/lib/libgcrypt/mpi/mpih-div.c
+++ b/grub-core/lib/libgcrypt/mpi/mpih-div.c
@@ -212,9 +212,9 @@ _gcry_mpih_divrem( mpi_ptr_t qp, mpi_size_t
qextra_limbs,

     switch(dsize) {
       case 0:
-       /* We are asked to divide by zero, so go ahead and do it!  (To make
-          the compiler not remove this statement, return the value.)  */
-       return 1 / dsize;
+       /* We are asked to divide by zero.  */
+       gcry_assert (0);
+       return 0;

       case 1:
        {

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