9pfs: Use g_new() & friends where that makes obvious sense

g_new(T, n) is neater than g_malloc(sizeof(T) * n).  It's also safer,
for two reasons.  One, it catches multiplication overflowing size_t.
Two, it returns T * rather than void *, which lets the compiler catch
more type errors.

This commit only touches allocations with size arguments of the form
sizeof(T).

Initial patch created mechanically with:

    $ spatch --in-place --sp-file scripts/coccinelle/use-g_new-etc.cocci \
	     --macro-file scripts/cocci-macro-file.h FILES...

This uncovers a typing error:

    ../hw/9pfs/9p.c: In function ‘qid_path_fullmap’:
    ../hw/9pfs/9p.c:855:13: error: assignment to ‘QpfEntry *’ from incompatible pointer type ‘QppEntry *’ [-Werror=incompatible-pointer-types]
      855 |         val = g_new0(QppEntry, 1);
	  |             ^

Harmless, because QppEntry is larger than QpfEntry.  Manually fixed to
allocate a QpfEntry instead.

Cc: Greg Kurz <groug@kaod.org>
Cc: Christian Schoenebeck <qemu_oss@crudebyte.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
Message-Id: <20220315144156.1595462-3-armbru@redhat.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c
index a6d6b3f835..8e9d4aea73 100644
--- a/hw/9pfs/9p.c
+++ b/hw/9pfs/9p.c
@@ -324,7 +324,7 @@ static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid)
             return NULL;
         }
     }
-    f = g_malloc0(sizeof(V9fsFidState));
+    f = g_new0(V9fsFidState, 1);
     f->fid = fid;
     f->fid_type = P9_FID_NONE;
     f->ref = 1;
@@ -804,7 +804,7 @@ static int qid_inode_prefix_hash_bits(V9fsPDU *pdu, dev_t dev)
 
     val = qht_lookup(&pdu->s->qpd_table, &lookup, hash);
     if (!val) {
-        val = g_malloc0(sizeof(QpdEntry));
+        val = g_new0(QpdEntry, 1);
         *val = lookup;
         affix = affixForIndex(pdu->s->qp_affix_next);
         val->prefix_bits = affix.bits;
@@ -852,7 +852,7 @@ static int qid_path_fullmap(V9fsPDU *pdu, const struct stat *stbuf,
             return -ENFILE;
         }
 
-        val = g_malloc0(sizeof(QppEntry));
+        val = g_new0(QpfEntry, 1);
         *val = lookup;
 
         /* new unique inode and device combo */
@@ -928,7 +928,7 @@ static int qid_path_suffixmap(V9fsPDU *pdu, const struct stat *stbuf,
             return -ENFILE;
         }
 
-        val = g_malloc0(sizeof(QppEntry));
+        val = g_new0(QppEntry, 1);
         *val = lookup;
 
         /* new unique inode affix and device combo */