Fix a bug in the assembly code.

Change-Id: Ic416e3f8a11e82ee298e6f709b2119a9ddf1e2f8
diff --git a/vp9/common/arm/neon/vp9_short_idct32x32_1_add_neon.asm b/vp9/common/arm/neon/vp9_short_idct32x32_1_add_neon.asm
index 1f03ff6..d290d07 100644
--- a/vp9/common/arm/neon/vp9_short_idct32x32_1_add_neon.asm
+++ b/vp9/common/arm/neon/vp9_short_idct32x32_1_add_neon.asm
@@ -117,7 +117,7 @@
     moveq            r12, r3
     cmp              r0, #0
     bne              diff_negative_32_32_loop
-    pop              {r3,pc}
+    pop              {pc}
 
 diff_positive_32_32
     usat             r0, #8, r0