Cleanup: Remove asserts when logging error messages.

If we produce CLOG_ERROR messages and the error is not actually
critical, there is no point in asserting too.

Mainly related to ID user counts, and a few other ID management areas.

source/blender/blenkernel/intern/lib_id.c

@@ -263,7 +263,6 @@ void id_us_ensure_real(ID *id)
                    "ID user count error: %s (from '%s')",
                    id->name,
                    id->lib ? id->lib->filepath_abs : "[Main]");
-        BLI_assert(0);
       }
       id->us = limit + 1;
       id->tag |= LIB_TAG_EXTRAUSER_SET;
@@ -321,7 +320,6 @@ void id_us_min(ID *id)
                    id->lib ? id->lib->filepath_abs : "[Main]",
                    id->us,
                    limit);
-        BLI_assert(0);
       }
       id->us = limit;
     }

source/blender/blenkernel/intern/lib_override.c

@@ -1218,7 +1218,6 @@ static ID *lib_override_root_find(Main *bmain, ID *id, const int curr_level, int
                "Levels of dependency relationships between library overrides IDs is way too high, "
                "skipping further processing loops (involves at least '%s')",
                id->name);
-    BLI_assert(0);
     return NULL;
   }
 
@@ -2339,7 +2338,6 @@ static int lib_override_sort_libraries_func(LibraryIDLinkCallbackData *cb_data)
           "loops (Involves at least '%s' and '%s')",
           id_owner->lib->filepath,
           id->lib->filepath);
-      BLI_assert(0);
       return IDWALK_RET_NOP;
     }
 

source/blender/blenkernel/intern/lib_remap.c

@@ -555,7 +555,6 @@ static void libblock_remap_foreach_idpair_cb(ID *old_id, ID *new_id, void *user_
                new_id ? new_id->name : "<NULL>",
                new_id,
                old_id->us - skipped_refcounted);
-    BLI_assert(0);
   }
 
   const int skipped_direct = old_id->runtime.remap.skipped_direct;

source/blender/blenkernel/intern/material.c

@@ -1245,7 +1245,6 @@ bool BKE_object_material_slot_remove(Main *bmain, Object *ob)
   /* this should never happen and used to crash */
   if (ob->actcol <= 0) {
     CLOG_ERROR(&LOG, "invalid material index %d, report a bug!", ob->actcol);
-    BLI_assert(0);
     return false;
   }