Create a single cmd_call() function to handle command execution

We should aim for a single point of entry to the commands, whichever
parser is used.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/main.c b/common/main.c
index 637da2b..6a3eac2 100644
--- a/common/main.c
+++ b/common/main.c
@@ -1370,9 +1370,8 @@
 #endif
 
 		/* OK - call function to do the command */
-		if ((cmdtp->cmd) (cmdtp, flag, argc, argv) != 0) {
+		if (cmd_call(cmdtp, flag, argc, argv) != 0)
 			rc = -1;
-		}
 
 		repeatable &= cmdtp->repeatable;