cython warnings: avoid maybe uninitialized

Author: tornaria

src/cysignals/signals.pyx

@@ -198,9 +198,9 @@ cdef int sig_raise_exception "sig_raise_exception"(int sig, const char* msg) exc
         PyErr_Format(SystemError, "unknown signal number %i", sig)
 
     # Save exception in cysigs.exc_value
-    cdef PyObject* typ
-    cdef PyObject* val
-    cdef PyObject* tb
+    cdef PyObject* typ = NULL
+    cdef PyObject* val = NULL
+    cdef PyObject* tb = NULL
     PyErr_Fetch(&typ, &val, &tb)
     PyErr_NormalizeException(&typ, &val, &tb)
     Py_XINCREF(val)

src/cysignals/tests.pyx

@@ -1280,7 +1280,7 @@ def test_thread_sig_block(long delay=DEFAULT_DELAY):
         >>> test_thread_sig_block()
 
     """
-    cdef pthread_t t1, t2
+    cdef pthread_t t1 = 0, t2 = 0
     with nogil:
         sig_on()
         if pthread_create(&t1, NULL, func_thread_sig_block, NULL):