fix C89 compat

Author: weltling

ext/mbstring/libmbfl/mbfl/mbfl_memory_device.c

@@ -239,11 +239,12 @@ mbfl_memory_device_strcat(mbfl_memory_device *device, const char *psrc)
 	if ((device->pos + len) >= device->length) {
 		/* reallocate buffer */
 		int newlen = device->length + (len + MBFL_MEMORY_DEVICE_ALLOC_SIZE)*sizeof(unsigned char);
+		unsigned char *tmp;
 		if (newlen <= 0) {
 			/* overflow */
 			return -1;
 		}
-		unsigned char *tmp = (unsigned char *)mbfl_realloc((void *)device->buffer, newlen*sizeof(unsigned char));
+		tmp = (unsigned char *)mbfl_realloc((void *)device->buffer, newlen*sizeof(unsigned char));
 		if (tmp == NULL) {
 			return -1;
 		}
@@ -270,11 +271,12 @@ mbfl_memory_device_strncat(mbfl_memory_device *device, const char *psrc, int len
 	if ((device->pos + len) >= device->length) {
 		/* reallocate buffer */
 		int newlen = device->length + len + MBFL_MEMORY_DEVICE_ALLOC_SIZE;
+		unsigned char *tmp;
 		if (newlen <= 0) {
 			/* overflow */
 			return -1;
 		}
-		unsigned char *tmp = (unsigned char *)mbfl_realloc((void *)device->buffer, newlen*sizeof(unsigned char));
+		tmp = (unsigned char *)mbfl_realloc((void *)device->buffer, newlen*sizeof(unsigned char));
 		if (tmp == NULL) {
 			return -1;
 		}
@@ -301,11 +303,12 @@ mbfl_memory_device_devcat(mbfl_memory_device *dest, mbfl_memory_device *src)
 	if ((dest->pos + src->pos) >= dest->length) {
 		/* reallocate buffer */
 		int newlen = dest->length + src->pos + MBFL_MEMORY_DEVICE_ALLOC_SIZE;
+		unsigned char *tmp;
 		if (newlen <= 0) {
 			/* overflow */
 			return -1;
 		}
-		unsigned char *tmp = (unsigned char *)mbfl_realloc((void *)dest->buffer, newlen*sizeof(unsigned char));
+		tmp = (unsigned char *)mbfl_realloc((void *)dest->buffer, newlen*sizeof(unsigned char));
 		if (tmp == NULL) {
 			return -1;
 		}