Handle NULL version pointer

src/include/version.h

@@ -14,6 +14,11 @@ version_parse(const char *version, int tuple[3])
 {
 	char buf[64];
 
+	if (version == NULL) {
+		err("parse_version: version is NULL\n");
+		return -1;
+	}
+
 	if (strlen(version) >= 64) {
 		err("parse_version: version too long: %s\n", version);
 		return -1;

test/unit/version.c

@@ -21,6 +21,7 @@ int main(void)
 		{ -1, "1",		{ 0, 0, 0 } },
 		{ -1, "1.O.O",		{ 0, 0, 0 } },
 		{ -1, "1.2.3rc",	{ 0, 0, 0 } },
+		{ -1, NULL,		{ 0, 0, 0 } },
 	};
 
 	int n = sizeof(cases) / sizeof(cases[0]);