Clean up buffer->swap_buffers() calls

That function checks for buffer->successful already.  No need
to check at call site.

src/gen-vowel-constraints.py

@@ -211,9 +211,7 @@ print ('  }')
 print ('  if (processed)')
 print ('  {')
 print ('    if (buffer->idx < count)')
-print ('     buffer->next_glyph ();')
-print ('    if (likely (buffer->successful))')
-print ('      buffer->swap_buffers ();')
+print ('      buffer->next_glyph ();')
 print ('  }')
 print ('}')
 

src/hb-aat-layout-common.hh

@@ -671,8 +671,7 @@ struct StateTableDriver
     {
       for (; buffer->successful && buffer->idx < buffer->len;)
 	buffer->next_glyph ();
-      if (likely (buffer->successful))
-	buffer->swap_buffers ();
+      buffer->swap_buffers ();
     }
   }
 

src/hb-aat-layout-morx-table.hh

@@ -1121,8 +1121,7 @@ struct mortmorx
       else
         buffer->next_glyph ();
     }
-    if (likely (buffer->successful))
-      buffer->swap_buffers ();
+    buffer->swap_buffers ();
   }
 
   inline void apply (hb_aat_apply_context_t *c) const

src/hb-ot-shape-complex-indic.cc

@@ -1018,7 +1018,6 @@ insert_dotted_circles (const hb_ot_shape_plan_t *plan HB_UNUSED,
     else
       buffer->next_glyph ();
   }
-
   buffer->swap_buffers ();
 }
 

src/hb-ot-shape-complex-khmer.cc

@@ -414,7 +414,6 @@ insert_dotted_circles (const hb_ot_shape_plan_t *plan HB_UNUSED,
     else
       buffer->next_glyph ();
   }
-
   buffer->swap_buffers ();
 }
 

src/hb-ot-shape-complex-myanmar.cc

@@ -343,7 +343,6 @@ insert_dotted_circles (const hb_ot_shape_plan_t *plan HB_UNUSED,
     else
       buffer->next_glyph ();
   }
-
   buffer->swap_buffers ();
 }
 

src/hb-ot-shape-complex-thai.cc

@@ -357,8 +357,7 @@ preprocess_text_thai (const hb_ot_shape_plan_t *plan,
 	buffer->merge_out_clusters (start - 1, end);
     }
   }
-  if (likely (buffer->successful))
-    buffer->swap_buffers ();
+  buffer->swap_buffers ();
 
   /* If font has Thai GSUB, we are done. */
   if (plan->props.script == HB_SCRIPT_THAI && !plan->map.found_script[0])

src/hb-ot-shape-complex-use.cc

@@ -552,7 +552,6 @@ insert_dotted_circles (const hb_ot_shape_plan_t *plan HB_UNUSED,
     else
       buffer->next_glyph ();
   }
-
   buffer->swap_buffers ();
 }
 

src/hb-ot-shape-complex-vowel-constraints.cc

@@ -429,9 +429,8 @@ _hb_preprocess_text_vowel_constraints (const hb_ot_shape_plan_t *plan HB_UNUSED,
   if (processed)
   {
     if (buffer->idx < count)
-     buffer->next_glyph ();
-    if (likely (buffer->successful))
-      buffer->swap_buffers ();
+      buffer->next_glyph ();
+    buffer->swap_buffers ();
   }
 }
 

src/hb-ot-shape.cc

@@ -425,7 +425,6 @@ hb_insert_dotted_circle (hb_buffer_t *buffer, hb_font_t *font)
   buffer->output_info (info);
   while (buffer->idx < buffer->len && buffer->successful)
     buffer->next_glyph ();
-
   buffer->swap_buffers ();
 }