apply: use skip_prefix instead of raw addition

diff --git a/column.c b/column.c
index 1a468debb4abdda3cbb90fcc4972b3d40da6f2ed..ca878bcea7a42476a7c2b03e74897a2af87bec3f 100644 (file)
--- a/column.c
+++ b/column.c
@@ -336,8 +336,9 @@ static int column_config(const char *var, const char *value,
 int git_column_config(const char *var, const char *value,
                      const char *command, unsigned int *colopts)
 {
-       const char *it = skip_prefix(var, "column.");
-       if (!it)
+       const char *it;
+
+       if (!skip_prefix(var, "column.", &it))
                return 0;
 
        if (!strcmp(it, "ui"))