zebra, bgpd: Fixup MULTIPATH_NUM usage to not consider 0

The code has spots where MULTIPATH_NUM set to 0 is equal to 64.
Now that MULTIPATH_NUM is set from the makefile to never be 0,
remove the code that depends on this.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
diff --git a/bgpd/bgp_vty.c b/bgpd/bgp_vty.c
index 987ff29..18a2226 100644
--- a/bgpd/bgp_vty.c
+++ b/bgpd/bgp_vty.c
@@ -737,7 +737,7 @@
       return CMD_WARNING;
     }
 
-  if ((MULTIPATH_NUM != 0) && (maxpaths > MULTIPATH_NUM))
+  if (maxpaths > MULTIPATH_NUM)
     vty_out (vty,
 	     "%% Warning: maximum-paths set to %d is greater than %d that zebra is compiled to support%s",
 	     maxpaths, MULTIPATH_NUM, VTY_NEWLINE);
@@ -770,7 +770,7 @@
       return CMD_WARNING;
     }
 
-  if ((MULTIPATH_NUM != 0) && (maxpaths > MULTIPATH_NUM))
+  if (maxpaths > MULTIPATH_NUM)
     vty_out (vty,
 	     "%% Warning: maximum-paths set to %d is greater than %d that zebra is compiled to support%s",
 	     maxpaths, MULTIPATH_NUM, VTY_NEWLINE);