qcacmn: Free buffer in ath_procfs_diag_read

A read buffer is allocated and used in
ath_procfs_diag_read and it is not freed
in one exit path which causes a memory leak

Free read buffer in all exit paths of
ath_procfs_diag_read

Change-Id: I1b2446a99f53c2f9130d395dd316eb4649eb24db
CRs-Fixed: 2352165
diff --git a/hif/src/ath_procfs.c b/hif/src/ath_procfs.c
index 5c9837f..5751437 100644
--- a/hif/src/ath_procfs.c
+++ b/hif/src/ath_procfs.c
@@ -108,8 +108,10 @@
 	}
 
 out:
-	if (rv)
+	if (rv) {
+		qdf_mem_free(read_buffer);
 		return -EIO;
+	}
 
 	if (copy_to_user(buf, read_buffer, count)) {
 		qdf_mem_free(read_buffer);