tools: ublimage: Fix memory leak in parse_cfg_file()

Dynamic memory, referenced by 'line', is allocated at ublimage.c:159
by calling function 'getline' and lost at ublimage.c:184.

Signed-off-by: Maks Mishin <maks.mishinFZ@gmail.com>
diff --git a/tools/ublimage.c b/tools/ublimage.c
index 8f9b58c..a1bd807 100644
--- a/tools/ublimage.c
+++ b/tools/ublimage.c
@@ -178,6 +178,7 @@
 					lineno, fld, &dcd_len);
 		}
 	}
+	free(line);
 	fclose(fd);
 
 	return dcd_len;