Memory footprint optimizations

As suggested by Wolfgang Denk:
- image printing functions:
  - remove wrappers
  - remove indentation prefix from functions' signatures
- merge getenv_verify and getenv_autostart into one parametrized function

Signed-off-by: Bartlomiej Sieka <tur@semihalf.com>
diff --git a/common/cmd_autoscript.c b/common/cmd_autoscript.c
index 1a37b90..932f638 100644
--- a/common/cmd_autoscript.c
+++ b/common/cmd_autoscript.c
@@ -65,7 +65,7 @@
 	size_t		fit_len;
 #endif
 
-	verify = getenv_verify ();
+	verify = getenv_yesno ("verify");
 
 	switch (genimg_get_format ((void *)addr)) {
 	case IMAGE_FORMAT_LEGACY: