external/gard: Fix uninitialised variable warning

 gcc -g -O3 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -m64 -Werror -Wall -g2 -ggdb -D_FORTIFY_SOURCE=2 -I. -I../../  -c gard.c -o gard.o
 gard.c: In function ‘main’:
 gard.c:741:5: error: ‘i’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
   if (i == ARRAY_SIZE(actions)) {
      ^
 cc1: all warnings being treated as errors

If we 'goto out;', we'll perform the check on 'i' without having
initialised it.

Signed-off-by: Jeremy Kerr <[email protected]>

Author: jk-ozlabs

external/gard/gard.c

@@ -620,7 +620,7 @@ int main(int argc, char **argv)
 	const char *fdt_flash_path = FDT_ACTIVE_FLASH_PATH;
 	char *filename = NULL;
 	struct gard_ctx _ctx, *ctx;
-	int i, rc;
+	int rc, i = 0;
 	bool part = 0;
 	bool ecc = 0;