style: Add void to function without arguments

After run `make CC=clang` we found the following problems:

    error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]

Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/vector.c b/src/vector.c
index 85368f6..704cbc4 100644
--- a/src/vector.c
+++ b/src/vector.c
@@ -22,7 +22,7 @@
 #include <string.h>
 
 vector_t *
-vector_new()
+vector_new(void)
 {
   vector_t *vector = (vector_t *)malloc(sizeof(vector_t));