revert rms_norm logic

Author: rmatif

ggml/src/ggml-opencl/ggml-opencl.cpp

@@ -2492,7 +2492,7 @@ static bool ggml_opencl_can_fuse(const struct ggml_cgraph * cgraph, int node_idx
 
         // if rms_norm is the B operand, then we don't handle broadcast
         if (rms_norm == mul->src[1] &&
-            !ggml_are_same_shape(mul->src[0], mul->src[1])) {
+            !ggml_are_same_shape(mul->src[0], rms_norm->src[1])) {
             return false;
         }