api-run-command.txt: describe error behavior of run_command functions

diff --git a/xdiff-interface.c b/xdiff-interface.c
index d782f06d9916bdde33dc3f7312f9eac4e14ef3a1..b9b0db8d86615d6ca1046b932772f3d9750a8062 100644 (file)
--- a/xdiff-interface.c
+++ b/xdiff-interface.c
@@ -15,11 +15,10 @@ static int parse_num(char **cp_p, int *num_p)
 {
        char *cp = *cp_p;
        int num = 0;
-       int read_some;
 
        while ('0' <= *cp && *cp <= '9')
                num = num * 10 + *cp++ - '0';
-       if (!(read_some = cp - *cp_p))
+       if (!(cp - *cp_p))
                return -1;
        *cp_p = cp;
        *num_p = num;