Return after we find the dispatched function.

If the dispatched function doesn't exit, then we get can get a
spurious function not found message. They all do exit, but this is a
little cleaner.

Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D18403

sbin/nvmecontrol/nvmecontrol.c

@@ -73,8 +73,10 @@ dispatch_set(int argc, char *argv[], struct nvme_function **tbl,
 	}
 
 	while (f < tbl_limit) {
-		if (strcmp(argv[1], (*f)->name) == 0)
+		if (strcmp(argv[1], (*f)->name) == 0) {
 			(*f)->fn(argc-1, &argv[1]);
+			return;
+		}
 		f++;
 	}