shell/sc_can: fix uninitialized warning

cladmi · cladmi · commit eec88e3e5300 · 2018-07-24T13:58:21.000+02:00
When compiled for `hifive1` board with `gcc-7.2.0` this warning was raised:

'ret' may be used uninitialized in this function [-Werror=maybe-uninitialized]
diff --git a/sys/shell/commands/sc_can.c b/sys/shell/commands/sc_can.c
@@ -83,7 +83,7 @@ static int _dump(int argc, char **argv)
         return 0;
     }
 
-    int ret;
+    int ret = -1;
     struct can_filter filters[SC_CAN_MAX_FILTERS];
     conn_can_raw_t conn;
     struct can_frame frame;

Original file line number	Diff line number	Diff line change
`@@ -83,7 +83,7 @@ static int _dump(int argc, char **argv)`
`83`	`83`	`return 0;`
`84`	`84`	`}`
`85`	`85`
`86`		`- int ret;`
	`86`	`+ int ret = -1;`
`87`	`87`	`struct can_filter filters[SC_CAN_MAX_FILTERS];`
`88`	`88`	`conn_can_raw_t conn;`
`89`	`89`	`struct can_frame frame;`