fit: check return value of fit_image_get_data_size()

GCC-10 reports:

In file included from tools/common/image-fit.c:1:
include/image.h: In function ‘fit_image_get_data_and_size’:
./tools/../common/image-fit.c:1015:9: warning: ‘len’ may be used
uninitialized in this function [-Wmaybe-uninitialized]
 1015 |   *size = len;
      |   ~~~~~~^~~~~
./tools/../common/image-fit.c:996:6: note: ‘len’ was declared here
  996 |  int len;
      |      ^~~

Add the missing check of the return value of fit_image_get_data_size().

Fixes: c3c863880479 ("add FIT data-position & data-offset property support")
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
diff --git a/common/image-fit.c b/common/image-fit.c
index f3bb00c..4435bc4 100644
--- a/common/image-fit.c
+++ b/common/image-fit.c
@@ -1011,8 +1011,10 @@
 	if (external_data) {
 		debug("External Data\n");
 		ret = fit_image_get_data_size(fit, noffset, &len);
-		*data = fit + offset;
-		*size = len;
+		if (!ret) {
+			*data = fit + offset;
+			*size = len;
+		}
 	} else {
 		ret = fit_image_get_data(fit, noffset, data, size);
 	}