[RFC PATCH] block/file-posix: Remove a deprecation warning on macOS 12

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

When building on macOS 12 we get:

  ../block/file-posix.c:3335:18: warning: 'IOMasterPort' is deprecated: first deprecated in macOS 12.0 [-Wdeprecated-declarations]
      kernResult = IOMasterPort( MACH_PORT_NULL, &masterPort );
                   ^~~~~~~~~~~~
                   IOMainPort

Use IOMainPort (define it to IOMasterPort on macOS < 12),
and replace 'master' by 'main' in a variable name.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 block/file-posix.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/block/file-posix.c b/block/file-posix.c
index b283093e5b..0dcfce1856 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -3324,17 +3324,22 @@ BlockDriver bdrv_file = {
 #if defined(__APPLE__) && defined(__MACH__)
 static kern_return_t GetBSDPath(io_iterator_t mediaIterator, char *bsdPath,
                                 CFIndex maxPathSize, int flags);
+
+#if !defined(MAC_OS_VERSION_12_0)
+#define IOMainPort IOMasterPort
+#endif
+
 static char *FindEjectableOpticalMedia(io_iterator_t *mediaIterator)
 {
     kern_return_t kernResult = KERN_FAILURE;
-    mach_port_t     masterPort;
+    mach_port_t mainPort;
     CFMutableDictionaryRef  classesToMatch;
     const char *matching_array[] = {kIODVDMediaClass, kIOCDMediaClass};
     char *mediaType = NULL;
 
-    kernResult = IOMasterPort( MACH_PORT_NULL, &masterPort );
+    kernResult = IOMainPort(MACH_PORT_NULL, &mainPort);
     if ( KERN_SUCCESS != kernResult ) {
-        printf( "IOMasterPort returned %d\n", kernResult );
+        printf("IOMainPort returned %d\n", kernResult);
     }
 
     int index;
@@ -3347,7 +3352,7 @@ static char *FindEjectableOpticalMedia(io_iterator_t *mediaIterator)
         }
         CFDictionarySetValue(classesToMatch, CFSTR(kIOMediaEjectableKey),
                              kCFBooleanTrue);
-        kernResult = IOServiceGetMatchingServices(masterPort, classesToMatch,
+        kernResult = IOServiceGetMatchingServices(mainPort, classesToMatch,
                                                   mediaIterator);
         if (kernResult != KERN_SUCCESS) {
             error_report("Note: IOServiceGetMatchingServices returned %d",
-- 
2.33.1