net: remove commented out line

Commit 1d5d292b79 ("net: split net into net{,-common,-legacy,-lwip}")
inadvertendly left a commented out declaration for do_wget() in
net-common.h. Remove it.

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

include/net-common.h

@@ -518,7 +518,6 @@ int wget_do_request(ulong dst_addr, char *uri);
  * Return:	true if uri is valid, false if uri is invalid
  */
 bool wget_validate_uri(char *uri);
-//int do_wget(struct cmd_tbl *cmdtp, int flag, int argc, char * const argv[]);
 
 /**
  * enum wget_http_method - http method