csv plugin: fix implicit conversion warning

src/csv.c:193:17: warning: implicit conversion loses integer precision: 'unsigned long' to 'int' [-Wshorten-64-to-32]
      int len = strlen(datadir);
          ~~~   ^~~~~~~~~~~~~~~

diff --git a/src/csv.c b/src/csv.c
index be59ede..88726bb 100644 (file)
--- a/src/csv.c
+++ b/src/csv.c
@@ -190,12 +190,12 @@ static int csv_config(const char *key, const char *value) {
     }
     datadir = strdup(value);
     if (datadir != NULL) {
-      int len = strlen(datadir);
+      size_t len = strlen(datadir);
       while ((len > 0) && (datadir[len - 1] == '/')) {
         len--;
         datadir[len] = '\0';
       }
-      if (len <= 0) {
+      if (len == 0) {
         free(datadir);
         datadir = NULL;
       }