main: Use _mesa_HashLock/UnlockMutex consistently

This is shorter and easier on the eyes. At the same time this
also ensures that we are always asserting that the table pointer
is not NULL. Currently that was not done for all situations.

Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>

src/mesa/main/hash.c

@@ -205,10 +205,9 @@ void *
 _mesa_HashLookup(struct _mesa_HashTable *table, GLuint key)
 {
    void *res;
-   assert(table);
-   mtx_lock(&table->Mutex);
+   _mesa_HashLockMutex(table);
    res = _mesa_HashLookup_unlocked(table, key);
-   mtx_unlock(&table->Mutex);
+   _mesa_HashUnlockMutex(table);
    return res;
 }
 
@@ -315,10 +314,9 @@ _mesa_HashInsertLocked(struct _mesa_HashTable *table, GLuint key, void *data)
 void
 _mesa_HashInsert(struct _mesa_HashTable *table, GLuint key, void *data)
 {
-   assert(table);
-   mtx_lock(&table->Mutex);
+   _mesa_HashLockMutex(table);
    _mesa_HashInsert_unlocked(table, key, data);
-   mtx_unlock(&table->Mutex);
+   _mesa_HashUnlockMutex(table);
 }
 
 
@@ -364,9 +362,9 @@ _mesa_HashRemoveLocked(struct _mesa_HashTable *table, GLuint key)
 void
 _mesa_HashRemove(struct _mesa_HashTable *table, GLuint key)
 {
-   mtx_lock(&table->Mutex);
+   _mesa_HashLockMutex(table);
    _mesa_HashRemove_unlocked(table, key);
-   mtx_unlock(&table->Mutex);
+   _mesa_HashUnlockMutex(table);
 }
 
 /**
@@ -385,9 +383,8 @@ _mesa_HashDeleteAll(struct _mesa_HashTable *table,
 {
    struct hash_entry *entry;
 
-   assert(table);
    assert(callback);
-   mtx_lock(&table->Mutex);
+   _mesa_HashLockMutex(table);
    table->InDeleteAll = GL_TRUE;
    hash_table_foreach(table->ht, entry) {
       callback((uintptr_t)entry->key, entry->data, userData);
@@ -398,7 +395,7 @@ _mesa_HashDeleteAll(struct _mesa_HashTable *table,
       table->deleted_key_data = NULL;
    }
    table->InDeleteAll = GL_FALSE;
-   mtx_unlock(&table->Mutex);
+   _mesa_HashUnlockMutex(table);
 }
 
 
@@ -434,9 +431,9 @@ _mesa_HashWalk(const struct _mesa_HashTable *table,
    /* cast-away const */
    struct _mesa_HashTable *table2 = (struct _mesa_HashTable *) table;
 
-   mtx_lock(&table2->Mutex);
+   _mesa_HashLockMutex(table2);
    hash_walk_unlocked(table, callback, userData);
-   mtx_unlock(&table2->Mutex);
+   _mesa_HashUnlockMutex(table2);
 }
 
 void