Fix printing of matrices on test failure: was overflowing (#10202)

tools/iree-e2e-matmul-test.c

diff --git a/tools/iree-e2e-matmul-test.c b/tools/iree-e2e-matmul-test.c
index 4cf36fa..210d4ea 100644
--- a/tools/iree-e2e-matmul-test.c
+++ b/tools/iree-e2e-matmul-test.c
@@ -620,9 +620,9 @@
                               context_env);
     }
   }
-  int m_start = iree_max(0, row - context);
+  int m_start = iree_max(0, (int)row - (int)context);
   int m_end = iree_min(m_size, row + context);
-  int n_start = iree_max(0, col - context);
+  int n_start = iree_max(0, (int)col - (int)context);
   int n_end = iree_min(n_size, col + context);
   // We have a lot more freedom to pick k_start, k_end, since these parameters
   // only affect which regions of the input lhs and rhs matrices are printed.