media: atomisp: fix inverted error check for ia_css_mipi_is_source_port_valid()

The function ia_css_mipi_is_source_port_valid() returns true if the port
is valid. So, we can't use the existing err variable as is.

To fix this issue while reusing that variable, invert the return value
when assigning it to the variable.

Fixes: 3c0538fb ("media: atomisp: get rid of most checks for ISP2401 version")
Signed-off-by: Tsuchiya Yuto <kitakar@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/staging/media/atomisp/pci/sh_css_mipi.c

@@ -423,10 +423,12 @@ allocate_mipi_frames(struct ia_css_pipe *pipe,
 		return 0; /* AM TODO: Check  */
 	}
 
-	if (!IS_ISP2401)
+	if (!IS_ISP2401) {
 		port = (unsigned int)pipe->stream->config.source.port.port;
-	else
-		err = ia_css_mipi_is_source_port_valid(pipe, &port);
+	} else {
+		/* Returns true if port is valid. So, invert it */
+		err = !ia_css_mipi_is_source_port_valid(pipe, &port);
+	}
 
 	assert(port < N_CSI_PORTS);
 
@@ -553,10 +555,12 @@ free_mipi_frames(struct ia_css_pipe *pipe)
 			return err;
 		}
 
-		if (!IS_ISP2401)
+		if (!IS_ISP2401) {
 			port = (unsigned int)pipe->stream->config.source.port.port;
-		else
-			err = ia_css_mipi_is_source_port_valid(pipe, &port);
+		} else {
+			/* Returns true if port is valid. So, invert it */
+			err = !ia_css_mipi_is_source_port_valid(pipe, &port);
+		}
 
 		assert(port < N_CSI_PORTS);
 
@@ -665,10 +669,12 @@ send_mipi_frames(struct ia_css_pipe *pipe)
 		/* TODO: AM: maybe this should be returning an error. */
 	}
 
-	if (!IS_ISP2401)
+	if (!IS_ISP2401) {
 		port = (unsigned int)pipe->stream->config.source.port.port;
-	else
-		err = ia_css_mipi_is_source_port_valid(pipe, &port);
+	} else {
+		/* Returns true if port is valid. So, invert it */
+		err = !ia_css_mipi_is_source_port_valid(pipe, &port);
+	}
 
 	assert(port < N_CSI_PORTS);