qemu: Rename qemuBuildShmemBackendStr to qemuBuildShmemBackendChrStr

There will be more backends in the future so let's not complicate it.
Signed-off-by: NMartin Kletzander <mkletzan@redhat.com>

src/qemu/qemu_command.c

@@ -8551,7 +8551,7 @@ qemuBuildShmemDevLegacyStr(virDomainDefPtr def,
 }
 
 static char *
-qemuBuildShmemBackendStr(virLogManagerPtr logManager,
+qemuBuildShmemBackendChrStr(virLogManagerPtr logManager,
                             virCommandPtr cmd,
                             virQEMUDriverConfigPtr cfg,
                             virDomainDefPtr def,
@@ -8612,7 +8612,7 @@ qemuBuildShmemCommandLine(virLogManagerPtr logManager,
     VIR_FREE(devstr);
 
     if (shmem->server.enabled) {
-        if (!(devstr = qemuBuildShmemBackendStr(logManager, cmd, cfg, def,
+        if (!(devstr = qemuBuildShmemBackendChrStr(logManager, cmd, cfg, def,
                                                    shmem, qemuCaps)))
             return -1;