boxing_nan.h, boxing_word.h: place newline before else

The mruby C style places `else` on its own line. Reformat the
remaining `} else {` / `} else if (...)` occurrences.

Co-authored-by: Claude <noreply@anthropic.com>

include/mruby/boxing_nan.h

@@ -103,7 +103,8 @@ mrb_unboxed_type(mrb_value o)
 {
   if (!mrb_float_p(o) && mrb_nb_tt(o) == MRB_NANBOX_TT_OBJECT && o.u != 0) {
     return ((struct RBasic*)(uintptr_t)o.u)->tt;
-  } else {
+  }
+  else {
     return MRB_TT_FALSE;
   }
 }

include/mruby/boxing_word.h

@@ -266,9 +266,11 @@ mrb_unboxed_type(mrb_value o)
 {
   if (mrb_nil_p(o)) {
     return MRB_TT_FALSE;
-  } else if ((o.w & WORDBOX_IMMEDIATE_MASK) == 0) {
+  }
+  else if ((o.w & WORDBOX_IMMEDIATE_MASK) == 0) {
     return mrb_val_union(o).bp->tt;
-  } else {
+  }
+  else {
     return MRB_TT_FALSE;
   }
 }