hv: fix "Else alternative missing in if."

All if . . else if constructs shall be
terminated with an else statement.

Tracked-On: #861
Signed-off-by: Huihuang Shi <huihuang.shi@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com

hypervisor/debug/shell.c

@@ -398,6 +398,8 @@ static int32_t shell_process_cmd(const char *p_input_line)
 			shell_puts("\r\nError: Invalid parameters.\r\n");
 		} else if (status != 0) {
 			shell_puts("\r\nCommand launch failed.\r\n");
+		} else {
+			/* No other state currently, do nothing */
 		}
 	}