Add semantic patch to fix isc_buffer_allocate usage, it cannot fail now

cocci/isc_buffer_allocate_never_fail.spatch

@@ -0,0 +1,84 @@
+@@
+statement S;
+expression V;
+@@
+
+- V =
+  isc_buffer_allocate(...);
+- if (V != ISC_R_SUCCESS) S
+
+@@
+statement S1, S2;
+expression V;
+@@
+
+- V =
+  isc_buffer_allocate(...);
+- if (V == ISC_R_SUCCESS)
+  S1
+- else S2
+
+@@
+expression V;
+@@
+
+- V =
+  isc_buffer_allocate(...);
+- check_result(V, ...);
+
+@@
+@@
+
+- CHECK(
+  isc_buffer_allocate(...)
+- )
+  ;
+
+@@
+@@
+
+- DO(...,
+  isc_buffer_allocate(...)
+- )
+  ;
+
+@@
+@@
+
+- RETERR(
+  isc_buffer_allocate(...)
+- )
+  ;
+
+@@
+expression V;
+@@
+
+- V =
+  isc_buffer_allocate(...);
+- assert_int_equal(V, ISC_R_SUCCESS);
+
+@@
+expression V;
+@@
+
+- V =
+  isc_buffer_allocate(...);
+- CHECK(..., V);
+
+@@
+expression V;
+statement S;
+@@
+
+- V =
+  isc_buffer_allocate(...);
+- if (ISC_UNLIKELY(V != ISC_R_SUCCESS)) S
+
+@@
+expression V;
+@@
+
+- V =
+  isc_buffer_allocate(...);
+- RUNTIME_CHECK(V == ISC_R_SUCCESS);