Fix file descriptor leak when opening invalid archives.

Also add -Wunreachable-code to the set of compiler flags, otherwise
noreturn becomes considerably less useful.

bug: https://code.google.com/p/android/issues/detail?id=171099
Change-Id: I9a95d45633c731c7046d4e4a39844d9cebfd1718
(cherrypick of 241bcf05e0e394bbf2681f359f52646dd6c707f6.)

fastboot/Android.mk

@@ -25,7 +25,7 @@ LOCAL_SRC_FILES := protocol.c engine.c bootimg_utils.cpp fastboot.cpp util.c fs.
 LOCAL_MODULE := fastboot
 LOCAL_MODULE_TAGS := debug
 LOCAL_CONLYFLAGS += -std=gnu99
-LOCAL_CFLAGS += -Wall -Wextra -Werror
+LOCAL_CFLAGS += -Wall -Wextra -Werror -Wunreachable-code
 
 LOCAL_CFLAGS += -DFASTBOOT_REVISION='"$(fastboot_version)"'
 

fastboot/fastboot.cpp

@@ -721,12 +721,14 @@ void do_update(usb_handle *usb, const char *filename, int erase_first)
     ZipArchiveHandle zip;
     int error = OpenArchive(filename, &zip);
     if (error != 0) {
+        CloseArchive(zip);
         die("failed to open zip file '%s': %s", filename, ErrorCodeString(error));
     }
 
     unsigned sz;
     void* data = unzip_file(zip, "android-info.txt", &sz);
     if (data == 0) {
+        CloseArchive(zip);
         die("update package '%s' has no android-info.txt", filename);
     }
 
@@ -738,6 +740,7 @@ void do_update(usb_handle *usb, const char *filename, int erase_first)
             if (images[i].is_optional) {
                 continue;
             }
+            CloseArchive(zip);
             exit(1); // unzip_to_file already explained why.
         }
         fastboot_buffer buf;

fastboot/fastboot.h

@@ -69,7 +69,7 @@ int fb_queue_is_empty(void);
 /* util stuff */
 double now();
 char *mkmsg(const char *fmt, ...);
-void die(const char *fmt, ...);
+__attribute__((__noreturn__)) void die(const char *fmt, ...);
 
 void get_my_path(char *path);