meta-google: gbmc-bridge: Fix uptime reading

We can't do floating point math so just chop it off.

Change-Id: I7f78f05856d774236d6e9746b69b362b6468ca0a
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-dhcp-term.sh b/meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-dhcp-term.sh
index c43647c..4cc0f6e 100644
--- a/meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-dhcp-term.sh
+++ b/meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-dhcp-term.sh
@@ -62,6 +62,8 @@
 
   # If the process is running, give it at least 5 minutes from when it started
   cur_s="$(cut -d' ' -f1 /proc/uptime)"
+  # Remove floating point if applied since bash can't perform float arithmetic
+  cur_s="${cur_s%.*}"
   if [[ "$activestr" == 'active' ]]; then
     active_ms="$(echo "$json" | jq -r '.data[0].ActiveEnterTimestampMonotonic.data')"
   else