Cleanup: redundant checks

In some cases moved the checks into asserts,
to ensure changes in the future don't cause
the checks to become necessary again.

source/blender/bmesh/intern/bmesh_log.c

@@ -788,7 +788,7 @@ void BM_log_redo(BMesh *bm, BMLog *log)
     /* Currently at the beginning of the undo stack, move to first entry */
     entry = log->entries.first;
   }
-  else if (entry && entry->next) {
+  else if (entry->next) {
     /* Move to next undo entry */
     entry = entry->next;
   }

source/blender/editors/interface/interface_templates.c

@@ -591,11 +591,9 @@ static void template_id_cb(bContext *C, void *arg_litem, void *arg_event)
           DEG_relations_tag_update(bmain);
         }
         else {
-          if (id) {
-            Main *bmain = CTX_data_main(C);
-            id_single_user(C, id, &template_ui->ptr, template_ui->prop);
-            DEG_relations_tag_update(bmain);
-          }
+          Main *bmain = CTX_data_main(C);
+          id_single_user(C, id, &template_ui->ptr, template_ui->prop);
+          DEG_relations_tag_update(bmain);
         }
       }
       break;

source/blender/editors/mesh/editmesh_tools.c

@@ -3382,11 +3382,9 @@ static int edbm_blend_from_shape_exec(bContext *C, wmOperator *op)
 
         if (use_add) {
           /* In add mode, we add relative shape key offset. */
-          if (kb) {
-            const float *rco = CustomData_bmesh_get_n(
-                &em->bm->vdata, eve->head.data, CD_SHAPEKEY, kb->relative);
-            sub_v3_v3v3(co, co, rco);
-          }
+          const float *rco = CustomData_bmesh_get_n(
+              &em->bm->vdata, eve->head.data, CD_SHAPEKEY, kb->relative);
+          sub_v3_v3v3(co, co, rco);
 
           madd_v3_v3fl(eve->co, co, blend);
         }

source/blender/editors/object/object_modes.c

@@ -282,7 +282,9 @@ static bool ed_object_mode_generic_exit_ex(struct Main *bmain,
       ED_object_posemode_exit_ex(bmain, ob);
     }
   }
-  else if ((ob->type == OB_GPENCIL) && ((ob->mode & OB_MODE_OBJECT) == 0)) {
+  else if (ob->type == OB_GPENCIL) {
+    /* Accounted for above. */
+    BLI_assert((ob->mode & OB_MODE_OBJECT) == 0);
     if (only_test) {
       return true;
     }

source/blender/editors/space_text/text_format_py.c

@@ -291,7 +291,7 @@ static int txtfmt_py_literal_numeral(const char *string, char prev_fmt)
     }
     /* Previous was a number; if immediately followed by '.' it's a floating point decimal number.
      * Note: keep the decimal point, it's needed to allow leading zeros. */
-    if ((prev_fmt == FMT_TYPE_NUMERAL) && (first == '.')) {
+    if (first == '.') {
       return txtfmt_py_find_numeral_inner(string);
     }
     /* "Imaginary" part of a complex number ends with 'j' */

source/blender/io/avi/intern/avi_rgb.c

@@ -97,7 +97,8 @@ void *avi_converter_from_avi_rgb(AviMovie *movie, int stream, unsigned char *buf
 
     if (buf) {
       size_t rowstride = movie->header->Width * 3;
-      if ((bits != 16) && (movie->header->Width % 2)) {
+      BLI_assert(bits != 16);
+      if (movie->header->Width % 2) {
         rowstride++;
       }
 

source/blender/windowmanager/intern/wm_operators.c

@@ -3516,7 +3516,7 @@ static int previews_clear_exec(bContext *C, wmOperator *op)
            BKE_idcode_to_idfilter(GS(id->name)) & id_filters);
 #endif
 
-    if (!id || !(BKE_idcode_to_idfilter(GS(id->name)) & id_filters)) {
+    if (!(BKE_idcode_to_idfilter(GS(id->name)) & id_filters)) {
       continue;
     }
 

source/blender/windowmanager/intern/wm_playanim.c

@@ -525,9 +525,7 @@ static void build_pict_list_ex(
       BLI_stringenc(filepath, fp_decoded.head, fp_decoded.tail, fp_decoded.digits, fp_framenr);
 
       while ((hasevent = GHOST_ProcessEvents(g_WS.ghost_system, 0))) {
-        if (hasevent) {
-          GHOST_DispatchEvents(g_WS.ghost_system);
-        }
+        GHOST_DispatchEvents(g_WS.ghost_system);
         if (ps->loading == false) {
           return;
         }