[Ecls-list] Patch: fix mmap() in _ecl_alloc_env()

[Josh Elsasser]

When mapping anonymous memory, the file descriptor argument should be
-1, not 0. On my system at least, passing 0 causes mmap to fail. The
check for mmap failure also did not work for me.

diff --git src/c/main.d src/c/main.d
index 9b63fa0..c48427b 100644
--- src/c/main.d
+++ src/c/main.d
@@ -212,8 +212,8 @@ _ecl_alloc_env()
 	cl_env_ptr output;
 #if defined(ECL_USE_MPROTECT)
 	output = mmap(0, sizeof(*output), PROT_READ | PROT_WRITE,
-			MAP_ANON | MAP_PRIVATE, 0, 0);
-	if (output < 0)
+			MAP_ANON | MAP_PRIVATE, -1, 0);
+	if (output == -1)
 		ecl_internal_error("Unable to allocate environment structure.");
 #else
 	output = ecl_alloc(sizeof(*output));