Remove unnecessary uses of reinterpret_cast.

Discovered while looking at compiler warnings (b/26936282).

Test: WITH_TIDY=1 WITH_STATIC_ANALYZER=1 mma
Change-Id: I66f8f6026ed732a504504ade93ff196dc8b727ca
diff --git a/minui/graphics.cpp b/minui/graphics.cpp
index 0680c32..dcca3ec 100644
--- a/minui/graphics.cpp
+++ b/minui/graphics.cpp
@@ -306,7 +306,7 @@
     gr_font->texture->pixel_bytes = 1;
 
     unsigned char* bits = static_cast<unsigned char*>(malloc(font.width * font.height));
-    gr_font->texture->data = reinterpret_cast<unsigned char*>(bits);
+    gr_font->texture->data = bits;
 
     unsigned char data;
     unsigned char* in = font.rundata;