src/rrd_graph.c: fix gcc warning "'tmp' may be used uninitialized in this function"

rrd_graph.c:2678:13: warning: 'tmp' may be used uninitialized in this function [-Wmaybe-uninitialized]
         tmp += 1.0;
             ^

diff --git a/src/rrd_graph.c b/src/rrd_graph.c
index a38c17aa2ea51f87ed75a72660546130451fb4f4..a912b03de6c36761bf4b651778874bb7883b0aa1 100644 (file)
--- a/src/rrd_graph.c
+++ b/src/rrd_graph.c
@@ -2645,7 +2645,7 @@ int horizontal_log_grid(
     int       mid = -1; /* row in yloglab for major grid */
     double    mspac;    /* smallest major grid spacing (pixels) */
     int       flab;     /* first value in yloglab to use */
-    double    value, tmp, pre_value;
+    double    value, tmp = 0.0, pre_value;
     double    X0, X1, Y0;
     char      graph_label[100];