iw: fix setting txpower (#10254)

SVN-Revision: 28710

package/iw/patches/130-fix_txpower.patch

@@ -0,0 +1,11 @@
+--- a/phy.c
++++ b/phy.c
+@@ -277,7 +277,7 @@ static int handle_txpower(struct nl80211
+ 		}
+ 
+ 		mbm = strtol(argv[1], &endptr, 10);
+-		if (!*endptr)
++		if (*endptr)
+ 			return 2;
+ 		NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_TX_POWER_LEVEL, mbm);
+ 	} else if (argc != 1)