[PATCH] semihosting/uaccess.c: Replaced a malloc call with g_malloc.

[dinglimin]

Replaced a call to malloc() and its respective call to free() with g_malloc() 
and g_free().

Signed-off-by: dinglimin <dingli...@cmss.chinamobile.com>

v4 -> V5:Use g_try_malloc() instead of malloc()
V3 -> V4:Delete null checks after g malloc().
V2 -> V3:softmmu_unlock_user changes free to g free.
V1 -> V2:if cpu_memory_rw_debug failed, still need to set p=NULL

Signed-off-by: dinglimin <dingli...@cmss.chinamobile.com>
---
 semihosting/uaccess.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/semihosting/uaccess.c b/semihosting/uaccess.c
index 8018828069..35fdcd69db 100644
--- a/semihosting/uaccess.c
+++ b/semihosting/uaccess.c
@@ -14,13 +14,20 @@
 void *softmmu_lock_user(CPUArchState *env, target_ulong addr,
                         target_ulong len, bool copy)
 {
-    void *p = malloc(len);
-    if (p && copy) {
+    void *p = g_try_malloc(len);
+
+    if (!p) {
+        p = NULL;
+        return p;
+    }
+
+    if (copy) {
         if (cpu_memory_rw_debug(env_cpu(env), addr, p, len, 0)) {
-            free(p);
+            g_free(p);
             p = NULL;
         }
     }
+
     return p;
 }
 
@@ -87,5 +94,5 @@ void softmmu_unlock_user(CPUArchState *env, void *p,
     if (len) {
         cpu_memory_rw_debug(env_cpu(env), addr, p, len, 1);
     }
-    free(p);
+    g_free(p);
 }
-- 
2.30.0.windows.2