[PATCH v4 00/10] xl: improve coding style and return more failure on

[Paulina Szubarczyk <paulinaszubarczyk@gmail.com>]

This is my bite-sized outreachy project [1][2]. 

The patch aims to improve coding_style and return failure for more xl commands:
- pci-*
-- tmem-*

After rebase to staging it seems that the patch {09} cleaning libxl_set_memory_target() 
to return useful error codes from [0] is not applied I resent it here.

In pci-* functions libxl__create_pci_backend(), libxl__device_pci_destroy_all()
error codes are returned instead of always 0.

Int the changes I follow CODING_STYLE as in the coresponding patches:
 - In general, don't initialize rc / r, but use set-and-goto
 - Use 'r' for non-libxl error codes
 - Use EXIT_FAILURE and EXIT_SUCCESS in main_foo()
 - Use 1 and 0 in internal functions of xl

[0] http://lists.xenproject.org/archives/html/xen-devel/2015-12/msg02246.html
[1] http://lists.xenproject.org/archives/html/xen-devel/2016-03/msg03031.html
[2] https://www.mail-archive.com/xen-devel@lists.xen.org/msg62055.html

Changed since v1:
 * Make  libxl__device_from_pcidev() return void instead 0.
 * Modify the libxl_device_pci_assignable_list() function to use
   only one 'out' cleaning path.
 * Changed exit() calls to 'return 1;' for set_memory_* and pci_* functions
   in xl_cmdimpl 
 * Added the error cleanup path 'out' in libxl_tmem_* functions and replaced 
   return with set-and-goto statements.
 * Use 'lrc' for return values to local functions libxl__*
 
 Changed since v2:
 * Revert the changes of 'exit() -> return 1;' since other patches take care of 
   that
 * Improve changelog messages 
 * Change in logging of libxc error 'LOGEV() -> LOG();  

 Changed since v3:
 * The pcidev_struct_fill() function is now void
 * Corrected indentation
 * Dropped opendir(NULL) call in the libxl_device_pci_assignable_list() 
   function
 * Change in logging of libxc error 'LOG() -> LOGE();  

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