qemucaps2xmltest: Don't leak @binary

There's no need to keep @binary around.
virQEMUCapsInitGuestFromBinary() duplicates the string anyway.

 1,002 bytes in 36 blocks are definitely lost in loss record 54 of 59
    at 0x483579F: malloc (vg_replace_malloc.c:299)
    by 0x796B1C7: vasprintf (vasprintf.c:73)
    by 0x4C3F2C6: virVasprintfInternal (virstring.c:740)
    by 0x4C3F3DC: virAsprintfInternal (virstring.c:761)
    by 0x13AFC9: testGetCaps (qemucaps2xmltest.c:105)
    by 0x13B200: testQemuCapsXML (qemucaps2xmltest.c:157)
    by 0x13B642: virTestRun (testutils.c:174)
    by 0x13B366: doCapsTest (qemucaps2xmltest.c:191)
    by 0x13FF2B: testQemuCapsIterate (testutilsqemu.c:941)
    by 0x13B427: mymain (qemucaps2xmltest.c:215)
    by 0x13D706: virTestMain (testutils.c:1096)
    by 0x13B489: main (qemucaps2xmltest.c:221)
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

tests/qemucaps2xmltest.c

@@ -100,7 +100,7 @@ testGetCaps(char *capsData, const testQemuData *data)
     virQEMUCapsPtr qemuCaps = NULL;
     virCapsPtr caps = NULL;
     virArch arch = virArchFromString(data->archName);
-    char *binary = NULL;
+    VIR_AUTOFREE(char *) binary = NULL;
 
     if (virAsprintf(&binary, "/usr/bin/qemu-system-%s", data->archName) < 0)
         goto error;
@@ -129,7 +129,6 @@ testGetCaps(char *capsData, const testQemuData *data)
  error:
     virObjectUnref(qemuCaps);
     virObjectUnref(caps);
-    VIR_FREE(binary);
     return NULL;
 }