avcodec/aacpsdsp_template: Fix undefined integer overflow in ps_add_squares_c()

Fixes runtime error: signed integer overflow: 1997494407 + 613252359 cannot be represented in type 'int'
Fixes: 2014/clusterfuzz-testcase-minimized-5186337030275072

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/aacpsdsp_template.c

@@ -30,7 +30,7 @@ static void ps_add_squares_c(INTFLOAT *dst, const INTFLOAT (*src)[2], int n)
 {
     int i;
     for (i = 0; i < n; i++)
-        dst[i] += AAC_MADD28(src[i][0], src[i][0], src[i][1], src[i][1]);
+        dst[i] += (UINTFLOAT)AAC_MADD28(src[i][0], src[i][0], src[i][1], src[i][1]);
 }
 
 static void ps_mul_pair_single_c(INTFLOAT (*dst)[2], INTFLOAT (*src0)[2], INTFLOAT *src1,