code will never be executed warning in `dictobject.c`

[sobolevn]

Bug report

Here's how this code looks right now:

cpython/Objects/dictobject.c

Lines 5489 to 5500 in c3643a1

	fail:
	di->di_dict = NULL;
	Py_DECREF(d);
	return -1;
	int res;
	try_locked:
	Py_BEGIN_CRITICAL_SECTION(d);
	res = dictiter_iternextitem_lock_held(d, self, out_key, out_value);
	Py_END_CRITICAL_SECTION();
	return res;
	}

gcc -c -fno-strict-overflow -Wsign-compare -Wunreachable-code -DNDEBUG -g -O3 -Wall -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -D_Py_TIER2=1 -D_Py_JIT -std=c11 -Wextra -Wno-unused-parameter -Wno-missing-field-initializers -Wstrict-prototypes -Werror=implicit-function-declaration -fvisibility=hidden -I./Include/internal -I./Include/internal/mimalloc -I. -I./Include -I/opt/homebrew/opt/openssl/include -I/opt/homebrew/opt/openssl/include -DPy_BUILD_CORE -o Objects/dictobject.o Objects/dictobject.c
Objects/dictobject.c:5494:5: warning: code will never be executed [-Wunreachable-code]
 int res;
 ^~~~~~~~
1 warning generated.

I have a PR ready.

Linked PRs

• gh-118849: Fix "code will never be executed" warning in dictobject.c #118850
• [3.13] gh-118849: Fix "code will never be executed" warning in dictobject.c (GH-118850) #118859