gaMain.c: warning: variable 'errs' is used uninitialized

gaMain.c:287:9: warning: variable 'errs' is used uninitialized whenever 'if' condition is true

clang18 -Wall warning cleanup [-Wsometimes-uninitialized]

garouter/gaMain.c

@@ -262,7 +262,7 @@ GARouteCmd(routeUse, netListName)
     CellUse *routeUse;
     char *netListName;
 {
-    int errs;
+    int errs = -1;
     NLNetList netList;
     GCRChannel *ch;
     NLNet *net;