https://git.ruby-lang.org/ruby.git/commit/?id=a5baf8d6bc

From a5baf8d6bc4c21259705f9b4f9aa2d9b9d7ab936 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 10 Dec 2021 18:33:17 +0900
Subject: Revert zero-check for alloca

Something weird results in int-in-bool-context and
stringop-overflow warnings.
---
 include/ruby/internal/memory.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/ruby/internal/memory.h b/include/ruby/internal/memory.h
index 242892d50f0..aa3464465da 100644
--- a/include/ruby/internal/memory.h
+++ b/include/ruby/internal/memory.h
@@ -284,7 +284,7 @@ typedef uint128_t DSIZE_T; https://github.com/ruby/ruby/blob/trunk/include/ruby/internal/memory.h#L284
  * @return      A pointer on stack.
  */
 #define ALLOCA_N(type,n) \
-    RBIMPL_CAST((type *)(!(n) ? NULL : alloca(rbimpl_size_mul_or_raise(sizeof(type), (n)))))
+    RBIMPL_CAST((type *)alloca(rbimpl_size_mul_or_raise(sizeof(type), (n))))
 
 /**
  * Identical to #RB_ALLOCV_N(), except it  implicitly assumes the type of array
@@ -297,7 +297,7 @@ typedef uint128_t DSIZE_T; https://github.com/ruby/ruby/blob/trunk/include/ruby/internal/memory.h#L297
  */
 #define RB_ALLOCV(v, n)        \
     ((n) < RUBY_ALLOCV_LIMIT ? \
-     ((v) = 0, !(n) ? NULL : alloca(n)) : \
+     ((v) = 0, alloca(n)) :    \
      rb_alloc_tmp_buffer(&(v), (n)))
 
 /**
@@ -330,7 +330,7 @@ typedef uint128_t DSIZE_T; https://github.com/ruby/ruby/blob/trunk/include/ruby/internal/memory.h#L330
 #define RB_ALLOCV_N(type, v, n)                             \
     RBIMPL_CAST((type *)                                     \
         (((size_t)(n) < RUBY_ALLOCV_LIMIT / sizeof(type)) ? \
-         ((v) = 0, !(n) ? NULL : alloca((n) * sizeof(type))) : \
+         ((v) = 0, alloca((n) * sizeof(type))) :            \
          rb_alloc_tmp_buffer2(&(v), (n), sizeof(type))))
 
 /**
-- 
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