atomisp2: remove cast from memory allocation

Patch removes the following warning issued was coccicheck:
WARNING: casting value returned by memory allocation function to (char *) is
useless.
Signed-off-by: Aishwarya Pant <aishpant@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/media/atomisp/pci/atomisp2/css2400/sh_css_firmware.c

@@ -145,7 +145,7 @@ sh_css_load_blob_info(const char *fw, const struct ia_css_fw_info *bi, struct ia
 		size_t configstruct_size = sizeof(struct ia_css_config_memory_offsets);
 		size_t statestruct_size = sizeof(struct ia_css_state_memory_offsets);
 
-		char *parambuf = (char *)kmalloc(paramstruct_size + configstruct_size + statestruct_size,
+		char *parambuf = kmalloc(paramstruct_size + configstruct_size + statestruct_size,
 					 GFP_KERNEL);
 		if (parambuf == NULL)
 			return IA_CSS_ERR_CANNOT_ALLOCATE_MEMORY;